v3.25.4
Investment Risks
Feb. 27, 2026
Janus Henderson Transformational Growth ETF | Market Risk  
Prospectus [Line Items]  
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Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics, and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Transformational Growth ETF | Portfolio Management Risk  
Prospectus [Line Items]  
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Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Transformational Growth ETF | Equity Securities Risk  
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Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The value of the Fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases. Further, regardless of how well individual companies or securities perform, the value of the Fund’s portfolio could also decrease if there are deteriorating economic or market conditions or perceptions regarding the industries which the issuers of securities the Fund holds participate.

Janus Henderson Transformational Growth ETF | Growth Securities Risk  
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Growth Securities Risk. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If portfolio management’s perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Fund’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from other types of securities and the market as a whole.

Janus Henderson Transformational Growth ETF | Issuer Concentration Risk  
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Issuer Concentration Risk. The Fund’s portfolio may be comprised of a relatively small number of issuers in comparison to other funds. As a result, the Fund may be subject to greater risks than a fund that invests in a greater number of issuers. A change in the value of any single investment held by the Fund may affect the overall value of the Fund more than it would affect a fund that holds more investments. In particular, the Fund may be more susceptible to adverse developments affecting any single issuer held by the Fund and may be susceptible to greater losses because of these developments. The Fund’s policy of concentrating its portfolio on a smaller number of holdings could result in more volatility in the Fund’s performance and share price.

Janus Henderson Transformational Growth ETF | Industry and Sector Risk  
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Industry and Sector Risk. The Fund may have a significant portion of its assets invested in securities of companies conducting similar business or businesses within the same economic sector or that relate to/benefit from the same theme. Companies in the same industry or economic sector may be similarly affected by economic or market events, making the

Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. As the Fund’s holdings change over time, the Fund’s exposure to a particular economic sector may fluctuate.

 

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Consumer Discretionary Sector Risk. Consumer product manufacturers and retailers are tied closely to the performance of the overall global economy, interest rates, and consumer confidence. Consumer product manufacturers and retailers depend heavily on disposable household income and discretionary consumer spending. Also, individual companies in the consumer discretionary sector are subject to intense competition, which may have a negative impact on their respective profitability. In addition, changes in demographics and consumer tastes can also negatively affect the demand for goods and services of companies in the consumer discretionary sector.

 

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Technology Sector Risk. In the technology sector, competitive pressures may have a significant effect on the performance of companies in which the Fund may invest. In addition, technology and technology-related companies often progress at an accelerated rate, and these companies may be subject to short product cycles and aggressive pricing, which may increase their volatility.

Janus Henderson Transformational Growth ETF | Large-Sized Companies Risk  
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Large-Sized Companies Risk. Large-sized companies may be less able than smaller-sized companies to adapt to changing market conditions. Large-sized companies may be more mature and subject to more limited growth potential compared with smaller sized companies. During different market cycles, the performance of large-sized companies has trailed the overall performance of the broader securities markets.

Janus Henderson Transformational Growth ETF | Small- and Mid-Sized Companies Risk  
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Small- and Mid-Sized Companies Risk. The Fund’s investments in securities issued by small- and mid-sized companies, which can include smaller, start-up companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. For example, they may also suffer more significant losses as a result of their narrow product lines, limited operating history, greater exposure to competitive threats, limited financial resources, limited trading markets, and the potential lack of management depth. Securities issued by small- and mid-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger or more established companies. These holdings are also subject to wider price fluctuations and tend to be less liquid than stocks of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as market conditions change.

Janus Henderson Transformational Growth ETF | Foreign Exposure Risk  
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Foreign Exposure Risk. Foreign markets can be more volatile than the U.S. market. As a result, the Fund’s returns and NAV may be affected by fluctuations in currency exchange rates or political or economic conditions in a particular country. Investments in foreign securities, particularly those of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio.

Janus Henderson Transformational Growth ETF | Emerging Markets Risk  
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Emerging Markets Risk. Emerging market securities involve a number of risks, which may result from less government supervision and regulation of business and industry practices (including the potential lack of strict finance and accounting controls and standards), stock exchanges, brokers, and listed companies. Information about emerging market companies, including financial information, may be less available or reliable and the Adviser’s ability to conduct due diligence with respect to such companies may be limited. Accordingly, these investments may be potentially more volatile in price and less liquid than investments in developed securities markets, resulting in greater risk to investors. There is a risk in developing countries that a current or future economic or political crisis could lead to price controls, forced mergers of companies, expropriation or confiscatory taxation, imposition or enforcement of foreign ownership limits, seizure, nationalization, sanctions or imposition of restrictions by various governmental entities on investment and trading, or creation of government monopolies, any of which may have a detrimental effect on the Fund’s investments. In addition, the taxation systems at the federal, regional, and local levels in developing or emerging market countries may be less transparent, inconsistently enforced, and subject to change. Emerging markets may be subject to a higher degree of corruption and fraud than developed markets, and financial institutions and transaction counterparties may have less financial sophistication, creditworthiness, and/or resources than participants in developed markets.

Janus Henderson Transformational Growth ETF | Depositary Receipts Risk  
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Depositary Receipts Risk. Depositary receipts are generally subject to the same sort of risks as direct investments in a foreign country, such as currency risk, market risk, and foreign exposure risk, because their values depend on the performance of a foreign security denominated in its home currency.

Janus Henderson Transformational Growth ETF | Securities Lending Risk  
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Securities Lending Risk. There is the risk that when portfolio securities are lent, the securities may not be returned on a timely basis, and the Fund may experience delays and costs in recovering the security or gaining access to the collateral provided to the Fund to collateralize the loan. If the Fund is unable to recover a security on loan, the Fund may use the collateral to purchase replacement securities in the market. There is a risk that the value of the collateral could decrease below the cost of the replacement security by the time the replacement investment is made, resulting in a loss to the Fund.

Janus Henderson Transformational Growth ETF | New/Smaller Sized Fund Risk  
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New/Smaller Sized Fund Risk. Because the Fund is relatively new, it has a limited operating history and a small asset base. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term if and when it becomes larger. If a new or smaller fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the Fund and tax consequences for investors.

Janus Henderson Transformational Growth ETF | ETF Risks  
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ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the Cboe BZX Exchange, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

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Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Transformational Growth ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Transformational Growth ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Transformational Growth ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
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Nondiversification Risk. The Fund is classified as nondiversified under the Investment Company Act of 1940, as amended (the “1940 Act”). This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s NAV and total return.

Janus Henderson Asset-Backed Securities ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s NAV may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Asset-Backed Securities ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Asset-Backed Securities ETF | Securities Lending Risk  
Prospectus [Line Items]  
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Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Asset-Backed Securities ETF | New/Smaller Sized Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

New/Smaller Sized Fund Risk. Because the Fund is relatively new, it has a limited operating history and a small asset base. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term if and when it becomes larger. If a new or smaller fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the Fund and tax consequences for investors.

Janus Henderson Asset-Backed Securities ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition,

there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

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Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Asset-Backed Securities ETF | Asset-Backed Securities Risk  
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Asset-Backed Securities Risk. Asset-backed securities may be adversely affected by changes in interest rates, underperformance of the underlying assets, the creditworthiness of the entities that provide any supporting letters of credit, surety bonds, or other credit or liquidity enhancements. In addition, most asset-backed securities are subject to prepayment risk in a declining interest rate environment, and extension risk in an increasing rate environment.

Janus Henderson Asset-Backed Securities ETF | Commercial Mortgage-Backed Securities Risk  
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Commercial Mortgage-Backed Securities Risk. CMBS are not backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages, particularly during periods of economic downturn. CMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. CMBS are subject to a greater degree of prepayment and extension risk than many other forms of fixed-income securities and therefore react differently to changes in interest rates than other bonds, and the prices of CMBS may reflect adverse economic and market conditions.

Janus Henderson Asset-Backed Securities ETF | Mortgage-Backed Securities Risk  
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Mortgage-Backed Securities Risk. Mortgage-backed securities are classified generally as either commercial mortgage-backed securities or residential mortgage-backed securities, each of which is subject to certain specific risks. Mortgage-backed securities may be more sensitive to changes in interest rates than other types of debt securities. Investments in mortgage-backed securities are subject to both extension risk and prepayment risk. These risks may reduce the Fund’s returns. In addition, investments in mortgage-backed securities may be subject to a higher degree of credit risk, valuation risk, and liquidity risk than various other types of fixed-income securities.

Janus Henderson Asset-Backed Securities ETF | Non-Agency Mortgage-Related Securities Risk  
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Non-Agency Mortgage-Related Securities Risk. Non-agency mortgage-related securities may not be subject to the same underwriting requirements for the underlying mortgages that are applicable to those mortgage-related securities that have a government or government-sponsored entity guarantee. As a result, the mortgage loans underlying non-agency mortgage-related securities may, and frequently do, have less favorable collateral, credit risk, or other underwriting characteristics than government or government-sponsored mortgage-related securities and have wider variances in a number of terms including interest rate, term, size, purpose, and borrower characteristics. The risk of nonpayment is greater for mortgage-related securities that are backed by loans that were originated under weak underwriting standards, including loans made to borrowers with limited means to make repayment. A level of risk exists for all loans, although, historically, the poorest performing loans have been those classified as subprime. “Subprime” loans are loans made to borrowers with lower credit ratings and/or a shorter credit history, who are more likely to default on their loan obligations as compared to more credit-worthy borrowers. Non-agency mortgage-related securities are not traded on an exchange. There may be a limited market for the securities, especially when there is a perceived weakness in the mortgage and real estate market sectors. Without an active trading market, mortgage-related securities held in the Fund’s portfolio may be particularly difficult to value because of the complexities involved in assessing the value of the underlying mortgage loans.

Janus Henderson Asset-Backed Securities ETF | Agency Mortgage-Backed Securities Risk  
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Agency Mortgage-Backed Securities Risk. Certain Agency mortgage-backed securities issued or guaranteed by agencies of the U.S. Government are guaranteed as to the payment of principal and interest by the relevant entity but have not been backed by the full faith and credit of the U.S. Government. Instead, they have been supported only by the discretionary authority of the U.S. Government to purchase the agency’s obligations. An event affecting the guaranteeing entity could adversely affect the payment of principal or interest or both on the security and, therefore, these types of securities should be considered to be riskier than U.S. Government securities.

Janus Henderson Asset-Backed Securities ETF | CMO Risk  
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CMO Risk. CMOs are a type of mortgage-backed security. CMOs are created by dividing the principal and interest payments collected on a pool of mortgages into several revenue streams (tranches) with different priority rights to portions of the underlying mortgage payments. Certain CMO tranches may represent a right to receive interest only (“IOs”), principal only (“POs”) or an amount that remains after floating-rate tranches are paid (an inverse floater). These securities are frequently referred to as “mortgage derivatives” and may be extremely sensitive to changes in interest rates. Interest rates on inverse floaters, for example, vary inversely with a short-term floating rate (which may be reset periodically). Interest rates on inverse floaters will decrease when short-term rates increase, and will increase when short-term rates decrease. These securities have the effect of providing a degree of investment leverage. In response to changes in market interest rates or other market conditions, the value of an inverse floater may increase or decrease at a multiple of the increase or decrease in the value of the underlying securities. If the Fund invests in CMO tranches (including CMO tranches issued by government agencies) and interest rates move in a manner not anticipated by the Adviser, it is possible that the Fund could lose all or substantially all of its investment.

Janus Henderson Asset-Backed Securities ETF | CLO Risk  
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CLO Risk. The risks of investing in CLOs include both the economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments. The degree of such risk will generally correspond to the specific tranche in which the Fund is invested. The Fund may invest in tranches of CLOs that are subordinate to other senor rated CLO tranches (such as AAA rated tranches). However, these ratings do not constitute a guarantee, may be downgraded in stressed market environments, and it is possible that even the most senior CLO tranches could experience losses due to actual defaults, increased sensitivity to defaults due to collateral default and the disappearance of the subordinated/equity tranches, market anticipation of defaults, as well as negative market sentiment with respect to CLO securities as an asset class. The Fund’s portfolio management may not be able to accurately predict how specific CLOs or the

portfolio of underlying loans for such CLOs will react to changes or stresses in the market, including changes in interest rates. The most common risks associated with investing in CLOs are liquidity risk, interest rate risk, credit risk, call risk, and the risk of default by the underlying assets, among others.

Janus Henderson Asset-Backed Securities ETF | CLO Manager Risk  
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CLO Manager Risk. CLOs are managed by investment advisers independent of the Adviser. CLO managers are responsible for selecting, managing and replacing the underlying bank loans within a CLO. As such, each CLO is subject to poor selections by its CLO manager. Adverse security selection by a CLO manager may cause a CLO to experience difficulty in making its stipulated distribution payments to investors because of the poor performance of the underlying bank loans: (i) entering into bankruptcy proceedings; and/or (ii) are in default as to the repayment of their loan balances. Generally, CLO managers mitigate these risks by maintaining a pool of underlying bank loans in excess of the minimum necessary to finance a CLO’s stipulated distribution payments.

 

In addition, CLO managers may have limited operating histories, may be subject to conflicts of interests, including managing the assets of other clients or other investment vehicles, or receiving fees that incentivize maximizing the yield, and indirectly the risk, of a CLO. Adverse developments with respect to a CLO manager, such as personnel and resource constraints, regulatory issues or other developments that may impact the ability and/or performance of the CLO manager, may adversely impact the performance of the CLO securities in which the Fund invests.

Janus Henderson Asset-Backed Securities ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
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Fixed-Income Securities Risk. The Fund invests in a variety of debt and other fixed-income securities that are generally subject to the following risks:

 

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Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

 

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Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

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Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

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Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

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Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

● Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).
Janus Henderson Asset-Backed Securities ETF | Derivatives Risk  
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Risk [Text Block]

Derivatives Risk. Derivatives can be volatile and involve risks in addition to the risks of the underlying referenced securities or asset. Gains or losses from a derivative investment can be substantially greater than the derivative’s original cost and can therefore involve leverage. Leverage may cause the Fund to be more volatile than if it had not used leverage because leverage can exaggerate the effect of any increase or decrease in the value of securities and other instruments held by the

Fund. Derivatives entail the risk that the counterparty to the derivative transaction will default on its payment obligations. Derivatives used for hedging purposes may reduce or eliminate gains or cause losses if the market moves in a manner different from that anticipated by portfolio management or if the cost of the derivative outweighs the benefit of the hedge.

Janus Henderson Asset-Backed Securities ETF | Counterparty Risk  
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Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Asset-Backed Securities ETF | Floating Rate Obligations Risk  
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Floating Rate Obligations Risk. The Fund may invest in floating rate obligations with interest rates that reset regularly, maintaining a fixed spread over a stated reference rate. The interest rates on floating rate obligations typically reset quarterly, although rates on some obligations may adjust at other intervals. Unexpected changes in the interest rates on floating rate obligations could result in lower income to the Fund. In addition, the secondary market on which floating rate obligations are traded may be less liquid than the market for investment grade securities or other types of income-producing securities, which may have an adverse impact on their market price. There is also a potential that there is no active market to trade floating rate obligations, that there may be restrictions on their transfer, or that the issuer may default. As a result, the Fund may be unable to sell floating rate obligations at the desired time or may be able to sell only at a price less than fair market value.

Janus Henderson Asset-Backed Securities ETF | Rule 144A Securities and Other Exempt Securities Risk  
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Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A under the Securities Act of 1933 (the “Securities Act”) and other securities exempt from certain registration requirements, could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Asset-Backed Securities ETF | Large Shareholder Risk  
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Large Shareholder Risk. To the extent a substantial percentage of the shares of the Fund are held by a small number of shareholders, including “fund of funds” or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these shareholders will purchase or redeem the Fund’s shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. These transactions could adversely affect the ability of the Fund to conduct its investment process.

Janus Henderson Asset-Backed Securities ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Asset-Backed Securities ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Asset-Backed Securities ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block] Nondiversification Risk. The Fund is classified as nondiversified under the Investment Company Act of 1940, as amended (the “1940 Act”). This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s NAV and total return.
Janus Henderson AAA CLO ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s NAV may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson AAA CLO ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson AAA CLO ETF | Foreign Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Foreign Exposure Risk. The Fund may have exposure to foreign markets as a result of its investments in foreign securities and securities denominated in foreign currencies. As a result, its returns and NAV may be affected by fluctuations in currency exchange rates or political or economic conditions in a particular country. Investments in foreign securities, particularly those

of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. The Fund’s investments may be denominated in foreign currencies and therefore, changes in the value of a country’s currency compared to the U.S. dollar may affect the value of the Fund’s investments.

Janus Henderson AAA CLO ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

 

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Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson AAA CLO ETF | CLO Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Risk. The risks of investing in CLOs include both the economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments. The degree of such risk will generally correspond to the specific tranche in which the Fund is invested. The Fund intends to invest primarily in AAA-rated tranches. Furthermore, this rating does not constitute a guarantee, may be downgraded in stressed market environments, and it is possible that even the most senior CLO tranches could experience losses due to actual defaults, increased sensitivity to defaults due to collateral default and significant losses experienced by subordinated/equity tranches, market anticipation of defaults, as well as negative

market sentiment with respect to CLO securities as an asset class. The Fund’s portfolio management may not be able to accurately predict how specific CLOs or the portfolio of underlying loans for such CLOs will react to changes or stresses in the market, including changes in interest rates. The most common risks associated with investing in CLOs are liquidity risk, interest rate risk, credit risk, prepayment risk, and the risk of default by the underlying assets, among others.

Janus Henderson AAA CLO ETF | CLO Manager Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Manager Risk. CLOs are managed by investment advisers independent of the Adviser. CLO managers are responsible for selecting, managing and replacing the underlying bank loans within a CLO. As such, each CLO is subject to poor selections by its CLO manager. Adverse security selection by a CLO manager may cause a CLO to experience difficulty in making its stipulated distribution payments to investors because of the poor performance of the underlying bank loans: (i) entering into bankruptcy proceedings; and/or (ii) are in default as to the repayment of their loan balances. Generally, CLO managers mitigate these risks by maintaining a pool of underlying bank loans in excess of the minimum necessary to finance a CLO’s stipulated distribution payments.

 

In addition, CLO managers may have limited operating histories, may be subject to conflicts of interests, including managing the assets of other clients or other investment vehicles, or receiving fees that incentivize maximizing the yield, and indirectly the risk, of a CLO. Adverse developments with respect to a CLO manager, such as personnel and resource constraints, regulatory issues or other developments that may impact the ability and/or performance of the CLO manager, may adversely impact the performance of the CLO securities in which the Fund invests.

Janus Henderson AAA CLO ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson AAA CLO ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson AAA CLO ETF | Debt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Debt Securities Risk. Variable-and floating-rate debt obligations (including CLOs and the portfolio of loans underlying the CLOs), as well as fixed-income debt instruments are subject to the following risks.

 

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Liquidity Risk. Liquidity risk refers to the possibility that the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. Infrequent trading of securities also may lead to an increase in their price volatility. CLOs, and their underlying loan obligations, are typically not registered for sale to the public and therefore are subject to certain restrictions on transfer and sale, potentially making them less liquid than other types of securities. Additionally, when the Fund purchases a newly issued CLO directly from the issuer (rather than from the secondary market), there often may be a delayed settlement period, during which time the liquidity of the CLO may be further reduced. During periods of limited liquidity and higher price volatility, the Fund’s ability to acquire or dispose of CLOs at a price and time the Fund deems advantageous may be impaired. CLOs are generally considered to be long-term investments and there is no guarantee that an active secondary market will exist or be maintained for any given CLO.

 

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Interest Rate Risk. As interest rates decrease, issuers of the underlying loan obligations may refinance any floating rate loans, which will result in a reduction in the principal value of the CLO’s portfolio and require the CLO to reinvest cash at an inopportune time. Conversely, as interest rates rise, borrowers with floating rate loans may experience difficulty in making payments, resulting in delinquencies and defaults, which will result in a reduction in cash flow to the CLO and the CLO investors, including the Fund. An increase in interest rates may cause the value of fixed-income securities held by the Fund to decline. The Fund may be subject to a greater risk of rising interest rates due to inflationary trends and the effect of government fiscal and monetary policy initiatives and resulting market reaction to those initiatives.

 

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Floating Rate Obligations Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction of income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. Generally, floating rate securities carry lower yields than fixed notes of the same maturity. The interest rate for a floating rate note resets or adjusts periodically by reference to a benchmark interest rate. The impact of interest rate changes on floating rate investments is typically mitigated by the periodic interest rate reset of the investments. Securities with longer durations tend to be more sensitive to interest rate changes, usually making them more volatile than securities with shorter durations. Benchmark interest rates, such as the Secured Overnight Financing Rate (“SOFR”), may not accurately track market interest rates.

 

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Prepayment Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity. CLOs are typically structured such that, after a specified period of time, the majority investor in the equity tranche can call (i.e., redeem) the securities issued by the CLO in full. The Fund may not be able to accurately predict when or which of its CLO investments may be called, resulting in the Fund having to reinvest the proceeds in unfavorable circumstances, which in turn could cause in a decline in the Fund’s income.

 

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Extension Risk. During periods of rising interest rates, certain debt obligations potentially including the portfolio of loans underlying a CLO will be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments.

 

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Income Risk. The Fund’s income may decline if interest rates fall. This decline in income can occur because most of the CLO debt instruments held by the Fund will have floating or variable interest rates.

 

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Credit Risk. Debt issuers and other counterparties may not honor their obligations or may have their debt downgraded by ratings agencies. Ratings provided by NRSROs represent their opinions of the claims-paying ability of the entities rated by them. Such ratings are general and are not absolute standards of quality. For CLOs, the primary source of credit risk is the ability of the underlying portfolio of loans to generate sufficient cash flow to pay investors on a full and timely basis when principal and/or interest payments are due. Default in payment on the underlying loans will result in less cash flow from the underlying portfolio and, in turn, less funds available to pay investors in the CLO.

 

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Covenant Lite Loans Risk. Certain of the underlying loans in which a CLO may invest may be issued or offered as “covenant lite” loans, which have few or no financial maintenance covenants that would require a borrower to maintain certain financial metrics. A CLO may be delayed in enforcing its interests in covenant lite loans, which may result in losses.

 

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Valuation Risk. Valuation Risk is the risk that one or more of the debt securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or security. The tiered structure of certain CLOs may subject them to price volatility and enhanced liquidity and valuation risk in times of market stress.

 

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Privately-Issued Securities Risk. CLOs are generally privately-issued securities, and are normally purchased pursuant to Rule 144A or Regulation S under the Securities Act of 1933, as amended (the “Securities Act”). Privately-issued securities typically may be resold only to qualified institutional buyers, in a privately negotiated transaction, to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund may find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held and traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s net asset value per share (“NAV”) due to the absence of an active trading market. There can be no assurance that a privately-issued security previously deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and its value may decline as a result.

Janus Henderson AAA CLO ETF | Investment Focus Risk  
Prospectus [Line Items]  
Risk [Text Block]

Investment Focus Risk. Because the Fund invests primarily in CLOs it is susceptible to an increased risk of loss due to adverse occurrences in the CLO market, generally, and in the various markets impacting the portfolios of loans underling these CLOs. The Fund’s CLO investment focus may cause the Fund to perform differently than the overall financial market and the Fund’s performance may be more volatile than if the Fund’s investments were more diversified across financial instruments and or markets.

Janus Henderson AAA CLO ETF | Newly Issued Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Newly Issued Securities Risk. The credit obligations in which the Fund invests may include newly issued securities, or “new issues,” such as initial debt offerings. New issues may have a magnified impact on the performance of the Fund during periods in which it has a small asset base. The impact of new issues on the Fund’s performance likely will decrease as the Fund’s asset size increases, which could reduce the Fund’s returns. New issues may not be consistently available to the Fund for investing, particularly as the Fund’s asset base grows. Certain new issues, such as initial debt offerings, may be volatile in price due to the absence of a prior trading market, limited quantities available for trading and limited information about the issuer. The Fund may hold new issues for a short period of time. This may increase the Fund’s portfolio turnover and may lead to increased expenses for the Fund, such as transaction costs. In addition, new issues can experience an immediate drop in value after issuance if the demand for the securities does not continue to support the offering price.

Janus Henderson AAA CLO ETF | Extended Settlement Risk  
Prospectus [Line Items]  
Risk [Text Block]

Extended Settlement Risk. Newly issued CLOs purchased in the primary market typically experience delayed or extended settlement periods. In the period following such a purchase and prior to settlement these CLOs may be considered less liquid than similar CLOs available in the secondary market. In such circumstances the Fund bears a risk of loss if the value of the CLO declines before the settlement date or if the Fund is required to sell the CLO prior to settlement. There is also the risk that the security will not be issued or that the counterparty will not meet its obligation, resulting in a loss of the investment opportunity.

Janus Henderson AAA CLO ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson AAA CLO ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson B-BBB CLO ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s NAV may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson B-BBB CLO ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson B-BBB CLO ETF | Foreign Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Foreign Exposure Risk. The Fund may have exposure to foreign markets as a result of its investments in foreign securities and securities denominated in foreign currencies. As a result, its returns and NAV may be affected by fluctuations in currency exchange rates or political or economic conditions in a particular country. Investments in foreign securities, particularly those of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. The Fund’s investments may be denominated in foreign currencies and therefore, changes in the value of a country’s currency compared to the U.S. dollar may affect the value of the Fund’s investments.

Janus Henderson B-BBB CLO ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the Cboe BZX Exchange, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson B-BBB CLO ETF | CLO Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Risk. The risks of investing in CLOs include both the economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments. The degree of such risk will generally correspond to the specific tranche in which the Fund is invested. The Fund intends to invest primarily in BBB-rated tranches and these tranches of CLOs are subordinate to other more senior tranches (such as AAA rated tranches). Furthermore, these ratings do not constitute a guarantee, may be downgraded in stressed market environments, and it is possible that even the most senior CLO tranches could experience losses due to actual defaults, increased sensitivity to defaults due to collateral default and the

significant losses experienced by subordinated/equity tranches, market anticipation of defaults, as well as negative market sentiment with respect to CLO securities as an asset class. The Fund’s portfolio management may not be able to accurately predict how specific CLOs or the portfolio of underlying loans for such CLOs will react to changes or stresses in the market, including changes in interest rates. The most common risks associated with investing in CLOs are liquidity risk, interest rate risk, credit risk, prepayment risk, and the risk of default by the underlying assets, among others.

 

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Mezzanine CLO Risk. The Fund intends to invest primarily in BBB rated CLO tranches. Such securities are often subordinate to higher-rated tranches in terms of payment priority. Subordinated CLO tranches are subject to higher credit risk and liquidity risk relative to more senior CLO tranches. To the extent a CLO or its underlying loans experience default or are having difficulty making principal and/or interest payments, such subordinate CLO tranches will be more likely to experience adverse impacts, and such impacts will be more severe, relative to more senior and/or higher-rated CLO securities, which in turn will adversely affect the performance of the Fund.

Janus Henderson B-BBB CLO ETF | CLO Manager Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Manager Risk. CLOs are managed by investment advisers independent of the Adviser. CLO managers are responsible for selecting, managing and replacing the underlying bank loans within a CLO. As such, each CLO is subject to poor selections by its CLO manager. Adverse security selection by a CLO manager may cause a CLO to experience difficulty in making its stipulated distribution payments to investors because of the poor performance of the underlying bank loans: (i) entering into bankruptcy proceedings; and/or (ii) are in default as to the repayment of their loan balances. Generally, CLO managers mitigate these risks by maintaining a pool of underlying bank loans in excess of the minimum necessary to finance a CLO’s stipulated distribution payments.

In addition, CLO managers may have limited operating histories, may be subject to conflicts of interests, including managing the assets of other clients or other investment vehicles, or receiving fees that incentivize maximizing the yield, and indirectly the risk, of a CLO. Adverse developments with respect to a CLO manager, such as personnel and resource constraints, regulatory issues or other developments that may impact the ability and/or performance of the CLO manager, may adversely impact the performance of the CLO securities in which the Fund invests.

Janus Henderson B-BBB CLO ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson B-BBB CLO ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson B-BBB CLO ETF | Debt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Debt Securities Risk. Variable-and floating-rate debt obligations (including CLOs and the portfolio of loans underlying the CLOs), as well as fixed-income debt instruments are subject to the following risks.

 

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Liquidity Risk. Liquidity risk refers to the possibility that the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. CLO securities in which the Fund invests may have limited liquidity in various market conditions, and in such instances will likely be less liquid than more senior or higher-rated CLOs. The CLO market, which has grown in recent years, remains smaller relative to other fixed-income instrument markets. Historic liquidity measures of CLOs may or may not be predictive of the liquidity of CLOs in the future. During adverse market conditions, there may be instances in which the market for trading CLOs becomes thin, or in extreme circumstances, particularly with respect to subordinate or lower-rated CLO tranches, may cease to exist during such period. In such circumstances, the price of the Fund’s CLO securities, and in turn Fund’s performance would be adversely impacted.

 

CLOs, and their underlying loan obligations, are typically not registered for sale to the public and therefore are subject to certain restrictions on transfer and sale, potentially making them less liquid than other types of securities.

 

Additionally, when the Fund purchases a newly issued CLO directly from the issuer (rather than from the secondary market), there often may be a delayed settlement period, during which time, the liquidity of the CLO may be further reduced. During periods of limited liquidity and higher price volatility, the Fund’s ability to acquire or dispose of CLOs at a price and time the Fund deems advantageous may be impaired. CLOs are generally considered to be long-term investments and there is no guarantee that an active secondary market will exist or be maintained for any given CLO.

 

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Credit Risk. Debt issuers and other counterparties may not honor their obligations or may have their debt downgraded by ratings agencies. Ratings provided by NRSROs represent their opinions of the claims-paying ability of the entities rated by them. Such ratings are general and are not absolute standards of quality. For CLOs, the primary source of credit risk is the ability of the underlying portfolio of loans to generate sufficient cash flow to pay investors on a full and timely basis when principal and/or interest payments are due. Default in payment on the underlying loans will result in less cash flow from the underlying portfolio and, in turn, less funds available to pay investors in the CLO.

 

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Interest Rate Risk. As interest rates decrease, issuers of the underlying loan obligations may refinance any floating rate loans, which will result in a reduction in the principal value of the CLO’s portfolio and require the CLO to reinvest cash at an inopportune time. Conversely, as interest rates rise, borrowers with floating rate loans may experience difficulty in making payments, resulting in delinquencies and defaults, which will result in a reduction in cash flow to the CLO and the CLO investors, including the Fund. An increase in interest rates may cause the value of fixed-income securities held by the Fund to decline. The Fund may be subject to a greater risk of rising interest rates due to inflationary trends and the effect of government fiscal and monetary policy initiatives and resulting market reaction to those initiatives.

 

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Floating Rate Obligations Risk. Securities with floating or variable interest rates can be less sensitive to interest rate changes than securities with fixed interest rates, but may decline in value if their interest rates do not rise as much, or as quickly, as interest rates in general. Conversely, floating rate securities will not generally increase in value if interest rates decline. A decline in interest rates may result in a reduction of income received from floating rate securities held by the Fund and may adversely affect the value of the Fund’s shares. Generally, floating rate securities carry lower yields than fixed notes of the same maturity. The interest rate for a floating rate note resets or adjusts periodically by reference to a benchmark interest rate. The impact of interest rate changes on floating rate investments is typically mitigated by the periodic interest rate reset

of the investments. Securities with longer durations tend to be more sensitive to interest rate changes, usually making them more volatile than securities with shorter durations. Benchmark interest rates, such as the Secured Overnight Financing Rate (“SOFR”), may not accurately track market interest rates.

 

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Prepayment Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity. CLOs are typically structured such that, after a specified period of time, the majority investor in the equity tranche can call (i.e., redeem) the securities issued by the CLO in full. The Fund may not be able to accurately predict when or which of its CLO investments may be called, resulting in the Fund having to reinvest the proceeds in unfavorable circumstances, which in turn could cause in a decline in the Fund’s income.

●

Extension Risk. During periods of rising interest rates, certain debt obligations potentially including the portfolio of loans underlying a CLO will be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments.

 

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Income Risk. The Fund’s income may decline if interest rates fall. This decline in income can occur because most of the CLO debt instruments held by the Fund will have floating or variable interest rates.

 

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Valuation Risk. Valuation Risk is the risk that one or more of the debt securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or security. The tiered structure of certain CLOs may subject them to price volatility and enhanced liquidity and valuation risk in times of market stress.

 

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Privately-Issued Securities Risk. CLOs are generally privately-issued securities, and are normally purchased pursuant to Rule 144A or Regulation S under the Securities Act of 1933, as amended (the “Securities Act”). Privately-issued securities typically may be resold only to qualified institutional buyers, in a privately negotiated transaction, to a limited number of purchasers, or in limited quantities after they have been held for a specified period of time and other conditions are met for an exemption from registration. Because there may be relatively few potential purchasers for such securities, especially under adverse market or economic conditions or in the event of adverse changes in the financial condition of the issuer, the Fund may find it more difficult to sell such securities when it may be advisable to do so or it may be able to sell such securities only at prices lower than if such securities were more widely held and traded. At times, it also may be more difficult to determine the fair value of such securities for purposes of computing the Fund’s net asset value per share (“NAV”) due to the absence of an active trading market. There can be no assurance that a privately-issued security previously deemed to be liquid when purchased will continue to be liquid for as long as it is held by the Fund, and its value may decline as a result.

 

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Covenant Lite Loans Risk. Certain of the underlying loans in which a CLO may invest may be issued or offered as “covenant lite” loans, which have few or no financial maintenance covenants that would require a borrower to maintain certain financial metrics. A CLO may be delayed in enforcing its interests in covenant lite loans, which may result in losses.

Janus Henderson B-BBB CLO ETF | Investment Focus Risk  
Prospectus [Line Items]  
Risk [Text Block]

Investment Focus Risk. Because the Fund invests primarily in CLOs it is susceptible to an increased risk of loss due to adverse occurrences in the CLO market, generally, and in the various markets impacting the portfolios of loans underling these CLOs. The Fund’s CLO investment focus may cause the Fund to perform differently than the overall financial market and the Fund’s performance may be more volatile than if the Fund’s investments were more diversified across financial instruments and or markets.

Janus Henderson B-BBB CLO ETF | Newly Issued Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Newly Issued Securities Risk. The credit obligations in which the Fund invests may include newly issued securities, or “new issues,” such as initial debt offerings. New issues may have a magnified impact on the performance of the Fund during periods in which it has a small asset base. The impact of new issues on the Fund’s performance likely will decrease as the Fund’s asset size increases, which could reduce the Fund’s returns. New issues may not be consistently available to the Fund for investing, particularly as the Fund’s asset base grows. Certain new issues, such as initial debt offerings, may be volatile in price due to the absence of a prior trading market, limited quantities available for trading and limited information about the issuer. The Fund may hold new issues for a short period of time. This may increase the Fund’s portfolio turnover and may lead to increased expenses for the Fund, such as transaction costs. In addition, new issues can experience an immediate drop in value after issuance if the demand for the securities does not continue to support the offering price.

Janus Henderson B-BBB CLO ETF | Extended Settlement Risk  
Prospectus [Line Items]  
Risk [Text Block]

Extended Settlement Risk. Newly issued CLOs purchased in the primary market typically experience delayed or extended settlement periods. In the period following such a purchase and prior to settlement these CLOs may be considered less liquid than similar CLOs available in the secondary market. In such circumstances the Fund bears a risk of loss if the value of the CLO declines before the settlement date or if the Fund is required to sell the CLO prior to settlement. There is also the risk that the security will not be issued or that the counterparty will not meet its obligation, resulting in a loss of the investment opportunity.

Janus Henderson B-BBB CLO ETF | Below Investment Grade CLO Risk  
Prospectus [Line Items]  
Risk [Text Block]

Below Investment Grade CLO Risk. The Fund may invest up to 15% of its net assets in CLO securities rated below investment grade. Debt securities rated below investment grade (including CLOs) are also referred to as high yield or “junk.” Such securities may be more sensitive than investment grade CLO securities to economic changes, political changes, industry or sector-specific changes, or adverse developments specific to the underlying loans of a CLO, which may adversely affect the value of the below investment grade CLO security. Below investment grade CLO securities are those rated below investment grade by NRSROs or are unrated CLOs of similar quality. The value of lower quality CLO securities is generally more dependent on credit risk than investment grade CLO securities. Issuers of the below investment grade loans that underlie a CLO may not be as strong financially as those issuers with higher credit ratings and are more vulnerable to real or perceived economic changes, political changes, or adverse developments specific to the issuer. In addition, the below investment grade CLO market is considered to be speculative in nature and can experience sudden and sharp price swings.

Janus Henderson B-BBB CLO ETF | Affiliated Underlying Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

Affiliated Underlying Fund Risk. The Adviser may invest in certain affiliated ETFs as investments for the Fund. The Adviser will generally receive fees for managing such funds, in addition to the fees paid to the Adviser by the Fund. The payment of such fees by affiliated funds creates a conflict of interest when selecting affiliated funds for investment in the Fund. The Adviser, however, is a fiduciary to the Fund and its shareholders and is legally obligated to act in its best interest when selecting affiliated funds. In addition, the Adviser has contractually agreed to waive and/or reimburse a portion of the Fund’s management fee in an amount equal to the management fee it earns as an investment adviser to any of the affiliated ETFs with respect to the Fund’s investment in such ETF, less certain operating expenses.

Janus Henderson B-BBB CLO ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson B-BBB CLO ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Corporate Bond ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Corporate Bond ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Corporate Bond ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. The Fund will not invest more than 25% of the value of its total assets in the securities of companies within the same industry, except that, to the extent that an industry represents 20% or more of the Fund’s benchmark at the time of investment, the Fund may invest up to 35% of its assets in that industry. The Fund may have a significant portion of its assets invested in securities of companies conducting similar business or businesses within the same economic sector. Companies in the same industry or economic sector may be similarly affected by negative economic or market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. As the Fund’s holdings change over time, the Fund’s exposure to a particular economic sector may fluctuate.

 

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Financial Services Sector Risk. To the extent the Fund invests its assets in the financial services sector, the Fund will have exposure to the risks inherent to the financial services sector. Financial services companies may be adversely affected by changes in regulatory framework or interest rates that may negatively affect financial services businesses; exposure of a financial institution to a nondiversified or concentrated loan portfolio; exposure to financial leverage and/or investments or agreements that, under certain circumstances, may lead to losses; and the risk that a market shock or other unexpected market, economic, political, regulatory, or other event might lead to a sudden decline in the values of most or all financial services companies.

Janus Henderson Corporate Bond ETF | Foreign Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Foreign Exposure Risk. Foreign securities, including emerging markets, can be more volatile than the U.S. market. As a result, the Fund’s returns and NAV may be affected to a large degree by political or economic conditions in a particular country. Investments in foreign securities, particularly those of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. Additionally, investments in securities of foreign governments involve the risk that a foreign government may not be willing or able to pay interest or repay principal when due.

Janus Henderson Corporate Bond ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Corporate Bond ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

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Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Corporate Bond ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Fixed-Income Securities Risk. Fixed-income securities are generally subject to the following risks:

 

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Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

 

●

Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

●

Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

●

Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

●

Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

●

Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).

Janus Henderson Corporate Bond ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

 

Janus Henderson Corporate Bond ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Corporate Bond ETF | Rule 144A Securities and Other Exempt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A under the Securities Act of 1933 (the “Securities Act”) and other securities exempt from certain registration requirements, could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Corporate Bond ETF | Corporate Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

Corporate Bond Risk. The investment return of corporate bonds reflects interest earned on the security and changes in the market value of the security. The market value of a corporate bond may be affected by changes in interest rates, the credit rating of the corporation, the corporation’s performance and perceptions of the corporation in the marketplace. The market value of a corporate bond generally may be expected to rise and fall inversely with interest rates. The market value of

intermediate and longer-term corporate bonds is generally more sensitive to changes in interest rates than is the market value of shorter-term corporate bonds. Corporate bonds are also subject to the credit risk of the issuer, as the issuer of corporate bonds may not be able to meet their obligations on interest or principal payments at the time called for by an instrument.

Janus Henderson Corporate Bond ETF | High-Yield Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

High-Yield Bond Risk. High-yield bonds (also known as “junk” bonds) are considered speculative and may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the entity that issued the bond, which may adversely affect their value.

Janus Henderson Corporate Bond ETF | Reverse Repurchase Agreement Risk  
Prospectus [Line Items]  
Risk [Text Block]

Reverse Repurchase Agreement Risk. Reverse repurchase agreements are transactions in which the Fund sells a security and simultaneously commits to repurchase that security from the buyer, such as a bank or broker-dealer, at an agreed upon price on an agreed upon future date. The repurchase price consists of the sale price plus an incremental amount reflecting the interest cost to the Fund on the proceeds it has received from the initial sale. Reverse repurchase agreements involve the risk that the value of securities that the Fund is obligated to repurchase under the agreement may decline below the repurchase price. Additionally, such transactions are only advantageous if the interest cost to the Fund of the reverse repurchase transaction is less than the cost of obtaining the cash otherwise. Interest costs on the proceeds received in a reverse repurchase agreement may exceed the return received on the investments made by the Fund with those proceeds, resulting in reduced returns to shareholders. When the Fund enters into a reverse repurchase agreement, it is subject to the risk that the buyer (counterparty) may default on its obligations to the Fund. In the event of such a default, the Fund may experience delays, costs, and losses, all of which may reduce returns to shareholders. Investing reverse repurchase proceeds may also have a leveraging effect on the Fund’s holdings. The Fund’s use of leverage can magnify the effect of any gains or losses, causing the Fund to be more volatile than if it had not been leveraged. There is no assurance that any leveraging strategy used by the Fund will be successful.

Janus Henderson Corporate Bond ETF | Leverage Risk  
Prospectus [Line Items]  
Risk [Text Block]

Leverage Risk. Leverage can magnify the effect of any gains or losses, causing the Fund to be more volatile than if it had not been leveraged. Certain commodity-linked derivatives may subject the Fund to leveraged market exposure to commodities. In addition, the Fund’s assets that are used as collateral to secure short sale transactions may decrease in value while the short positions are outstanding, which may force the Fund to use its other assets to increase collateral. There is no assurance that a leveraging strategy will be successful.

Janus Henderson Corporate Bond ETF | Smaller Sized Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

Smaller Sized Fund Risk. Because the Fund has a small asset base, large inflows and outflows may have a disproportionate impact, negative or positive, on the Fund’s performance, which may be more volatile than that of a larger fund. If a smaller fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the Fund and tax consequences for investors.

Janus Henderson Corporate Bond ETF | Portfolio Turnover Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Turnover Risk. Increased portfolio turnover may result in higher costs which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders. The Fund’s relative value trading may result in increased portfolio turnover.

Janus Henderson Corporate Bond ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Corporate Bond ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Emerging Markets Debt Hard Currency ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Emerging Markets Risk  
Prospectus [Line Items]  
Risk [Text Block]

Emerging Markets Risk. Emerging market securities involve a number of risks, which may result from less government supervision and regulation of business and industry practices (including the potential lack of strict finance and accounting controls and standards), stock exchanges, brokers, and listed companies. Information about emerging market companies, including financial information, may be less available or reliable and the Adviser’s ability to conduct due diligence with respect to such companies may be limited. Accordingly, these investments may be potentially more volatile in price and less liquid than investments in developed securities markets, resulting in greater risk to investors. There is a risk in developing countries that a current or future economic or political crisis could lead to price controls, forced mergers of companies, expropriation or confiscatory taxation, imposition or enforcement of foreign ownership limits, seizure, nationalization, sanctions or imposition of restrictions by various governmental entities on investment and trading, or creation of government monopolies, any of which may have a detrimental effect on the Fund’s investments. In addition, the taxation systems at

the federal, regional, and local levels in developing or emerging market countries may be less transparent, inconsistently enforced, and subject to change. Emerging markets may be subject to a higher degree of corruption and fraud than developed markets, and financial institutions and transaction counterparties may have less financial sophistication, creditworthiness, and/or resources than participants in developed markets. In addition, the Fund’s investments may be denominated in foreign currencies and therefore, changes in the value of a foreign currency compared to the U.S. dollar may affect the value of the Fund’s investments. To the extent that the Fund invests a significant portion of its assets in the securities of emerging markets issuers in or companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region, which could have a negative impact on the Fund’s performance.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Emerging Markets Debt Hard Currency ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

●

Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

●

Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Fixed-Income Securities Risk. Fixed-income securities are generally subject to the following risks:

 

●

Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

 

●

Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

●

Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

●

Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

●

Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

●

Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).

Janus Henderson Emerging Markets Debt Hard Currency ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

 

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Total Return Swaps Risk. A total return swap is a contract in which one party agrees to make periodic payments to another party based on the change in market value of the assets underlying the contract, which may include a specified security, basket of securities, or securities indices during the specified period, in return for periodic payments based on a fixed or variable interest rate or the total return from other underlying assets. Total return swap agreements may be used to obtain exposure to a security or market without owning or taking physical custody of such security or investing directly in such market. Total return swap agreements may effectively add leverage to a fund’s portfolio because, in addition to its total net assets, the fund would be subject to investment exposure on the notional amount of the swap. The primary risks associated with total returns swaps are credit risks (if the counterparty fails to meet its obligations) and market risk (if there is no liquid market for the agreement or unfavorable changes occur to the underlying asset).

Janus Henderson Emerging Markets Debt Hard Currency ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Rule 144A Securities and Other Exempt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A under the Securities Act of 1933 (the “Securities Act”) and other securities exempt from certain registration requirements, could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Large Shareholder Risk  
Prospectus [Line Items]  
Risk [Text Block]

Large Shareholder Risk. To the extent a substantial percentage of the shares of the Fund are held by a small number of shareholders, including “fund of funds” or accounts over which the Adviser has investment discretion, the Fund is subject to the risk that these shareholders will purchase or redeem the Fund’s shares in large amounts rapidly or unexpectedly, including as a result of an asset allocation decision made by the Adviser. These transactions could adversely affect the ability of the Fund to conduct its investment process.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Corporate Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

Corporate Bond Risk. The investment return of corporate bonds reflects interest earned on the security and changes in the market value of the security. The market value of a corporate bond may be affected by changes in interest rates, the credit rating of the corporation, the corporation’s performance and perceptions of the corporation in the marketplace. The market value of a corporate bond generally may be expected to rise and fall inversely with interest rates. The market value of intermediate and longer-term corporate bonds is generally more sensitive to changes in interest rates than is the market value of shorter-term corporate bonds. Corporate bonds are also subject to the credit risk of the issuer, as the issuer of corporate bonds may not be able to meet their obligations on interest or principal payments at the time called for by an instrument.

Janus Henderson Emerging Markets Debt Hard Currency ETF | High-Yield Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

High-Yield Bond Risk. High-yield bonds (also known as “junk” bonds) are considered speculative and may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the entity that issued the bond, which may adversely affect their value. High-yield bonds are bonds rated below investment grade by Nationally Recognized Statistical Rating Organizations (“NRSROs”) or are unrated bonds of similar credit quality. The value of lower quality bonds generally is more dependent on credit risk than investment grade bonds. Issuers of high-yield bonds may

not be as strong financially as those issuing bonds with higher credit ratings and are more vulnerable to real or perceived economic changes, political changes, or adverse developments specific to the issuer. In addition, the junk bond market can experience sudden and sharp price swings.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Frontier Markets Risk  
Prospectus [Line Items]  
Risk [Text Block]

Frontier Markets Risk. Frontier markets are those emerging markets that are considered to be among the smallest, least mature and least liquid, and as a result, may be more likely to experience inflation, political turmoil and rapid changes in economic conditions than more developed and traditional emerging markets. Investments in frontier markets may be subject to a greater risk of loss than investments in more developed and traditional emerging markets. Frontier markets often have less uniformity in accounting and reporting requirements, unreliable securities valuations and greater risk associated with custody of securities. Economic, political, illiquidity and currency risks may be more pronounced with respect to investments in frontier markets than in emerging markets.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Sovereign and Quasi-Sovereign Debt Risk  
Prospectus [Line Items]  
Risk [Text Block]

Sovereign and Quasi-Sovereign Debt Risk. Investments in non-U.S. government debt securities and debt securities issued by entities affiliated with or backed by non-U.S. governmental entities, especially the debt of certain emerging market countries, can involve a high degree of risk, including the risk that the entity that controls the repayment of the debt may not be willing or able to repay the principal and/or to pay the interest on its debt in a timely manner. In times of economic uncertainty, the prices of these securities may be more volatile than those of corporate debt obligations or of other government debt obligations.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Geographic Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Geographic Concentration Risk. To the extent the Fund invests a substantial amount of its assets in issuers located in a single country or region, the economic, political, social, regulatory, or other developments or conditions within such country or region will generally have a greater effect on the Fund than they would on a more geographically diversified fund, which may result in greater losses and volatility. Adverse developments in certain regions could also adversely affect securities of other countries whose economies appear to be unrelated and could have a negative impact on the Fund’s performance.

 

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Risk of Investing in Africa and the Middle East. Many African and Middle Eastern countries have histories of dictatorships, political, and military unrest, and their markets should be considered extremely volatile even when compared with those of other emerging market countries. Many of these countries tend to have inadequate investor protections and less established custody, settlement, regulatory, auditing, and financial standards. In addition, certain of these countries are highly reliant on exporting oil so their economies can be negatively impacted by declines in commodity prices or declines in global economic activity.

 

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Risk of Investing in Europe. The economies and markets of European countries are often closely connected and interdependent. Changes in regulations on trade, decreasing imports or exports, changes in the exchange rate of European currencies, default or threat of a default by a European country on its sovereign debt, and budget deficits and recessions among European countries may have a significant adverse effect on the economies of other European countries and major trading partners outside Europe. The markets in Eastern Europe remain relatively undeveloped and can be particularly sensitive to political and economic developments.

 

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Risk of Investing in Latin America. Many Latin American countries have histories of inflation, exorbitant interest rates, government overspending, political instability, and social and economic unrest. These countries are among the largest debtors of emerging markets countries and certain Latin American countries have previously imposed limitations on the ability of investors to repatriate investment income, capital, or the proceeds of the sale of securities.

Janus Henderson Emerging Markets Debt Hard Currency ETF | New Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

New Fund Risk. Because the Fund is relatively new, it has a limited operating history. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term. If a new fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the fund and tax consequences for investors.

Janus Henderson Emerging Markets Debt Hard Currency ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Emerging Markets Debt Hard Currency ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Emerging Markets Debt Hard Currency ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block] Nondiversification Risk. The Fund is classified as nondiversified under the Investment Company Act of 1940, as amended (the “1940 Act”). This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s NAV and total return.
Janus Henderson Income ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Income ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Income ETF | Foreign Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Foreign Exposure Risk. Foreign markets can be more volatile than the U.S. market. As a result, the Fund’s returns and NAV may be affected by fluctuations in currency exchange rates or political or economic conditions in a particular country. Investments in foreign securities, particularly those of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. The Fund’s investments may be denominated in foreign currencies and therefore, changes in the value of a country’s currency compared to the U.S. dollar may affect the value of the Fund’s investments.

Janus Henderson Income ETF | Emerging Markets Risk  
Prospectus [Line Items]  
Risk [Text Block]

Emerging Markets Risk. Emerging market securities involve a number of risks, which may result from less government supervision and regulation of business and industry practices (including the potential lack of strict finance and accounting controls and standards), stock exchanges, brokers, and listed companies. Information about emerging market companies, including financial information, may be less available or reliable and the Adviser’s ability to conduct due diligence with respect to such companies may be limited. Accordingly, these investments may be potentially more volatile in price and less liquid than investments in developed securities markets, resulting in greater risk to investors. There is a risk in developing countries that a current or future economic or political crisis could lead to price controls, forced mergers of companies, expropriation or confiscatory taxation, imposition or enforcement of foreign ownership limits, seizure, nationalization, sanctions or imposition of restrictions by various governmental entities on investment and trading, or creation of government monopolies, any of which may have a detrimental effect on the Fund’s investments. In addition, the taxation systems at the federal, regional, and local levels in developing or emerging market countries may be less transparent, inconsistently enforced, and subject to change. Emerging markets may be subject to a higher degree of corruption and fraud than developed markets, and financial institutions and transaction counterparties may have less financial sophistication, creditworthiness, and/or resources than participants in developed markets.

Janus Henderson Income ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Income ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

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Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Income ETF | CLO Manager Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Manager Risk. CLOs are managed by investment advisers independent of the Adviser. CLO managers are responsible for selecting, managing and replacing the underlying bank loans within a CLO. As such, each CLO is subject to poor selections by its CLO manager. Adverse security selection by a CLO manager may cause a CLO to experience difficulty in making its stipulated distribution payments to investors because of the poor performance of the underlying bank loans: (i) entering into bankruptcy proceedings; and/or (ii) are in default as to the repayment of their loan balances. Generally, CLO managers mitigate these risks by maintaining a pool of underlying bank loans in excess of the minimum necessary to finance a CLO’s stipulated distribution payments.

 

In addition, CLO managers may have limited operating histories, may be subject to conflicts of interests, including managing the assets of other clients or other investment vehicles, or receiving fees that incentivize maximizing the yield, and indirectly the risk, of a CLO. Adverse developments with respect to a CLO manager, such as personnel and resource constraints, regulatory issues or other developments that may impact the ability and/or performance of the CLO manager, may adversely impact the performance of the CLO securities in which the Fund invests.

Janus Henderson Income ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Fixed-Income Securities Risk. Fixed-income securities are generally subject to the following risks:

 

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Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed- income and related markets to heightened volatility.

 

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Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

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Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

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Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

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Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

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Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).

Janus Henderson Income ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson Income ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Income ETF | Floating Rate Obligations Risk  
Prospectus [Line Items]  
Risk [Text Block]

Floating Rate Obligations Risk. The Fund may invest in floating rate obligations with interest rates that reset regularly, maintaining a fixed spread over a stated reference rate. The interest rates on floating rate obligations typically reset quarterly, although rates on some obligations may adjust at other intervals. Unexpected changes in the interest rates on floating rate obligations could result in lower income to the Fund. In addition, the secondary market on which floating rate obligations are traded may be less liquid than the market for investment grade securities or other types of income-producing securities, which may have an adverse impact on their market price. There is also a potential that there is no active market to trade floating rate obligations, that there may be restrictions on their transfer, or that the issuer may default. As a result, the Fund may be unable to sell floating rate obligations at the desired time or may be able to sell only at a price less than fair market value.

Janus Henderson Income ETF | Rule 144A Securities and Other Exempt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A and other securities exempt from certain registration requirements could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Income ETF | Affiliated Underlying Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

Affiliated Underlying Fund Risk. The Adviser may invest in certain affiliated ETFs as investments for the Fund. The Adviser will generally receive fees for managing such funds, in addition to the fees paid to the Adviser by the Fund. The payment of such fees by affiliated funds creates a conflict of interest when selecting affiliated funds for investment in the Fund. The Adviser, however, is a fiduciary to the Fund and its shareholders and is legally obligated to act in its best interest when selecting affiliated funds. In addition, the Adviser has contractually agreed to waive and/or reimburse a portion of the Fund’s management fee in an amount equal to the management fee it earns as an investment adviser to any of the affiliated ETFs with respect to the Fund’s investment in such ETF, less certain operating expenses.

Janus Henderson Income ETF | Corporate Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

Corporate Bond Risk. The investment return of corporate bonds reflects interest earned on the security and changes in the market value of the security. The market value of a corporate bond may be affected by changes in interest rates, the credit rating of the corporation, the corporation’s performance and perceptions of the corporation in the marketplace. The market value of a corporate bond generally may be expected to rise and fall inversely with interest rates. The market value of intermediate and longer-term corporate bonds is generally more sensitive to changes in interest rates than is the market value of shorter-term corporate bonds. Corporate bonds are also subject to the credit risk of the issuer, as the issuer of corporate bonds may not be able to meet their obligations on interest or principal payments at the time called for by an instrument.

Janus Henderson Income ETF | High-Yield Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

High-Yield Bond Risk. High-yield bonds (also known as “junk” bonds) are considered speculative and may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the entity that issued the bond, which may adversely affect their value. High-yield bonds are bonds rated below investment grade by Nationally Recognized Statistical Rating Organizations (“NRSROs”) or are unrated bonds of similar credit quality. The value of lower quality bonds generally is more dependent on credit risk than investment grade bonds. Issuers of high-yield bonds may not be as strong financially as those issuing bonds with higher credit ratings and are more vulnerable to real or perceived economic changes, political changes, or adverse developments specific to the issuer. In addition, the junk bond market can experience sudden and sharp price swings.

Janus Henderson Income ETF | Portfolio Turnover Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Turnover Risk. Increased portfolio turnover may result in higher costs, which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders.

Janus Henderson Income ETF | New Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

New Fund Risk. Because the Fund is relatively new, it has a limited operating history. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term. If a new fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the fund and tax consequences for investors.

Janus Henderson Income ETF | Mortgage- and Asset-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Mortgage- and Asset-Backed Securities Risk. Mortgage- and asset-backed securities represent interests in “pools” of commercial or residential mortgages or other assets, including consumer loans or receivables. The value of mortgage- and asset-backed securities will be influenced by factors affecting the real estate market and the assets underlying these securities. Investments in mortgage-and asset-backed securities may be subject to credit risk, valuation risk, liquidity risk, extension risk, and prepayment risk. These securities also are subject to risk of default on the underlying mortgage or asset, particularly during periods of economic downturn.

Janus Henderson Income ETF | Loan Risk  
Prospectus [Line Items]  
Risk [Text Block]

Loan Risk. Bank loans are obligations of companies or other entities sometimes entered into in connection with recapitalizations, acquisitions, and refinancings. The Fund’s investments in bank loans are generally acquired as a participation interest in, or assignment of, loans originated by a lender or other financial institution. These investments may include institutionally-traded floating and fixed-rate debt securities. The bank loans underlying these securities often involve borrowers with low credit ratings whose financial conditions are troubled or uncertain, including companies that are highly leveraged. Loans are subject to credit risk, interest rate risk, and liquidity risk. Investments in certain commercial loans, such as bridge loans, DIP loans, and mezzanine loans subject the Fund to other risks. Bridge loans involve certain risks in addition to those associated with bank loans, including the risk that the borrower may be unable to locate permanent financing to replace the bridge loan, which may impair the borrower’s perceived creditworthiness. DIP loans are subject to the risk that the entity will not emerge from bankruptcy and will be forced to liquidate its assets. Mezzanine loans generally are rated below investment grade, and frequently are unrated. Because mezzanine loans typically are the most subordinated debt obligation in an issuer’s capital structure, they are subject to the additional risk that the cash flow of the related borrower and any property securing the loan may be insufficient to repay the loan after the related borrower pays off any senior obligations.

Janus Henderson Income ETF | Collateralized Loan Obligation Risk  
Prospectus [Line Items]  
Risk [Text Block]

Collateralized Loan Obligation Risk. The risks of investing in a CLO include both the economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments. The degree of such risk will generally correspond to the specific tranche in which the Fund is invested. Higher rated tranches (such as AAA rated tranches) do not constitute a guarantee, may be downgraded, and in stressed market environments it is possible that even the most senior CLO tranches could experience losses due to actual defaults, increased sensitivity to defaults due to collateral default and significant losses experienced by subordinated/equity tranches, market anticipation of defaults, as well as negative market sentiment with respect to CLO securities as an asset class. The Fund’s portfolio management may not be able to accurately predict how specific CLOs or the portfolio of underlying loans for such CLOs will react to changes or stresses in the market, including changes in interest rates. The most common risks associated with investing in CLOs are liquidity risk, interest rate risk, credit risk, prepayment risk, and the risk of default by the underlying assets, among others.

Janus Henderson Income ETF | TBA Commitments Risk  
Prospectus [Line Items]  
Risk [Text Block]

TBA Commitments Risk. Although TBA commitments must meet industry-accepted “good delivery” standards, there can be no assurance that a security purchased on a forward commitment basis will ultimately be issued or delivered by the counterparty. If the counterparty to a transaction fails to deliver the securities, the Fund could suffer a loss. Because TBA commitments do not require the delivery of a specific security, the characteristics of a security delivered to the Fund may be less favorable than expected. There is a risk that the security that the Fund buys will lose value between the purchase and settlement dates. TBA purchase and sales commitments may significantly increase the Fund’s portfolio turnover rate and are not included in the portfolio turnover rate calculation.

Janus Henderson Income ETF | Credit Risk Transfer Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Credit Risk Transfer Securities Risk. CRTs are unguaranteed and unsecured fixed or floating rate general obligations that are commonly issued by government sponsored enterprises. CRTs are not directly linked to or backed by the underlying mortgage loans, so investors such as the Fund have no direct recourse to the underlying mortgage loans in the event of a default. The risks associated with CRTs are different from the risks associated with investments in mortgage-backed securities issued by government sponsored enterprises or private issuers because some or all of the mortgage default or credit risk associated with the underlying mortgage loans is transferred to investors who hold CRTs. These risks are in addition to the risks described under “Fixed-Income Securities Risk.”

Janus Henderson Income ETF | Sovereign Debt Risk  
Prospectus [Line Items]  
Risk [Text Block]

Sovereign Debt Risk. Investments in U.S. and non-U.S. government debt securities (“sovereign debt”), especially the debt of certain emerging market countries, can involve a high degree of risk, including the risk that the governmental entity that controls the repayment of sovereign debt may not be willing or able to repay the principal and/or to pay the interest on its sovereign debt in a timely manner. A sovereign debtor’s willingness or ability to satisfy its debt obligation may be affected by various factors including, but not limited to, its cash flow situation, the extent of its foreign currency reserves, the availability of foreign exchange when a payment is due, and the relative size of its debt position in relation to its economy as a whole. In the event of default, there may be limited or no legal remedies for collecting sovereign debt and there may be no bankruptcy proceedings through which the Fund may collect all or part of the sovereign debt that a governmental entity has not repaid. In addition, to the extent the Fund invests in non-U.S. sovereign debt, it may be subject to currency risk.

Janus Henderson Income ETF | Short Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Short Exposure Risk. The Fund may enter into a derivatives transaction to obtain short investment exposure to the underlying reference asset. If the value of the underlying reference asset on which the Fund has obtained a short investment exposure increases, the Fund will incur a loss. This potential loss is theoretically unlimited. A short exposure through a derivative also exposes the Fund to credit risk, counterparty risk, and leverage risk.

Janus Henderson Income ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Income ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Income ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block] Nondiversification Risk. The Fund is classified as nondiversified under the Investment Company Act of 1940, as amended (the “1940 Act”). This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s NAV and total return.
Janus Henderson Mortgage-Backed Securities ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Mortgage-Backed Securities ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Mortgage-Backed Securities ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Mortgage-Backed Securities ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

●

Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Mortgage-Backed Securities ETF | Asset-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Asset-Backed Securities Risk. Asset-backed securities may be adversely affected by changes in interest rates, underperformance of the underlying assets, the creditworthiness of the entities that provide any supporting letters of credit, surety bonds, or other credit or liquidity enhancements. In addition, most asset-backed securities are subject to prepayment risk in a declining interest rate environment, and extension risk in an increasing interest rate environment.

Janus Henderson Mortgage-Backed Securities ETF | Mortgage-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Mortgage-Backed Securities Risk. Mortgage-backed securities are classified generally as either commercial mortgage-backed securities or residential mortgage-backed securities, each of which is subject to certain specific risks. Mortgage-backed securities may be more sensitive to changes in interest rates than other types of debt securities. Investments in mortgage-backed securities are subject to both extension risk and prepayment risk. These risks may reduce the Fund’s returns. In addition, investments in mortgage-backed securities, including those comprised of subprime mortgages, may be subject to a higher degree of credit risk, valuation risk, and liquidity risk than various other types of fixed-income securities.

Janus Henderson Mortgage-Backed Securities ETF | Non-Agency Mortgage-Related Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Non-Agency Mortgage-Related Securities Risk. Non-agency mortgage-related securities may not be subject to the same underwriting requirements for the underlying mortgages that are applicable to those mortgage-related securities that have a government or government-sponsored entity guarantee. As a result, the mortgage loans underlying non-agency mortgage-related securities may, and frequently do, have less favorable collateral, credit risk, or other underwriting characteristics

than government or government-sponsored mortgage-related securities and have wider variances in a number of terms including interest rate, term, size, purpose, and borrower characteristics. The risk of nonpayment is greater for mortgage-related securities that are backed by loans that were originated under weak underwriting standards, including loans made to borrowers with limited means to make repayment. A level of risk exists for all loans, although, historically, the poorest performing loans have been those classified as subprime. “Subprime” loans are loans made to borrowers with lower credit ratings and/or a shorter credit history, who are more likely to default on their loan obligations as compared to more credit-worthy borrowers. Non-agency mortgage-related securities are not traded on an exchange. There may be a limited market for the securities, especially when there is a perceived weakness in the mortgage and real estate market sectors. Without an active trading market, mortgage-related securities held in the Fund’s portfolio may be particularly difficult to value because of the complexities involved in assessing the value of the underlying mortgage loans.

Janus Henderson Mortgage-Backed Securities ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Fixed-Income Securities Risk. Fixed-income securities are generally subject to the following risks:

 

●

Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

 

●

Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

●

Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

●

Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

●

Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

●

Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).

Janus Henderson Mortgage-Backed Securities ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson Mortgage-Backed Securities ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Mortgage-Backed Securities ETF | Rule 144A Securities and Other Exempt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A under the Securities Act of 1933 (the “Securities Act”) and other securities exempt from certain registration requirements, could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Mortgage-Backed Securities ETF | High-Yield Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

High-Yield Bond Risk. High-yield bonds (also known as “junk” bonds) are considered speculative and may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the entity that issued the bond, which may adversely affect their value.

Janus Henderson Mortgage-Backed Securities ETF | Reverse Repurchase Agreement Risk  
Prospectus [Line Items]  
Risk [Text Block]

Reverse Repurchase Agreement Risk. Reverse repurchase agreements are transactions in which the Fund sells a security and simultaneously commits to repurchase that security from the buyer, such as a bank or broker-dealer, at an agreed upon price on an agreed upon future date. Reverse repurchase agreements involve the risk that the value of securities that the Fund is obligated to repurchase under the agreement may decline below the repurchase price. Additionally, such transactions are only advantageous if the interest cost to the Fund of the reverse repurchase transaction is less than the cost of obtaining the cash otherwise. Interest costs on the proceeds received in a reverse repurchase agreement may exceed the return received on the investments made by the Fund with those proceeds, resulting in reduced returns to shareholders. When the Fund enters into a reverse repurchase agreement, it is subject to the risk that the buyer (counterparty) may default on its obligations to the Fund. In the event of such a default, the Fund may experience delays, costs, and losses, all of which may reduce returns to

shareholders. Investing reverse repurchase agreement proceeds may also have a leveraging effect on the Fund’s holdings. The Fund’s use of leverage can magnify the effect of any gains or losses, causing the Fund to be more volatile than if it had not been leveraged. There is no assurance that any leveraging strategy used by the Fund will be successful.

Janus Henderson Mortgage-Backed Securities ETF | Leverage Risk  
Prospectus [Line Items]  
Risk [Text Block]

Leverage Risk. The risk associated with certain types of leveraged investments or trading strategies pursuant to which relatively small market movements may result in large changes in the value of an investment. The Fund creates leverage by investing in instruments where the investment loss can exceed the original amount invested. The use of other investment techniques, such as short sales and certain derivative transactions, can create a leveraging effect on the Fund.

Janus Henderson Mortgage-Backed Securities ETF | TBA Commitments Risk  
Prospectus [Line Items]  
Risk [Text Block]

TBA Commitments Risk. The Fund will typically enter into “to be announced” or “TBA” commitments for mortgage-backed securities and, at times, the portion of the Fund’s portfolio allocated to TBA securities may be significant. Although TBA securities must meet industry-accepted “good delivery” standards, there can be no assurance that a security purchased on a forward commitment basis will ultimately be issued or delivered by the counterparty. If the counterparty to a transaction fails to deliver the securities, the Fund could suffer a loss. Because TBA commitments do not require the delivery of a specific security, the characteristics of a security delivered to the Fund may be less favorable than expected. There is a risk that the security that the Fund buys will lose value between the purchase and settlement dates. TBA purchase and sales commitments may significantly increase the Fund’s portfolio turnover rate and are not included in the portfolio turnover rate calculation.

Janus Henderson Mortgage-Backed Securities ETF | Credit Risk Transfer Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Credit Risk Transfer Securities Risk. CRTs are unguaranteed and unsecured fixed and floating rate general obligations that are commonly issued by a government sponsored enterprise. CRTs are not directly linked to or backed by the underlying mortgage loans, so investors such as the Fund have no direct recourse to the underlying mortgage loans in the event of a default. The risks associated with CRTs are different from the risks associated with investments in mortgage-backed securities issued by government sponsored enterprises or private issuers because some or all of the mortgage default or credit risk associated with the underlying mortgage loans is transferred to investors who hold CRTs. Additional risks associated with investments in CRTs may include credit, prepayment, extension, interest rate, and market risk.

Janus Henderson Mortgage-Backed Securities ETF | Short Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Short Exposure Risk. The Fund may enter into a derivatives transaction to obtain short investment exposure to the underlying reference asset. If the value of the underlying reference asset on which the Fund has obtained a short investment exposure increases, the Fund will incur a loss. This potential loss is theoretically unlimited. A short exposure through a derivative also exposes the Fund to credit risk, counterparty risk, and leverage risk.

Janus Henderson Mortgage-Backed Securities ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Mortgage-Backed Securities ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Securitized Income ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Securitized Income ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Securitized Income ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Securitized Income ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

●

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

●

Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

●

Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

●

Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Securitized Income ETF | Asset-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Asset-Backed Securities Risk. ABS may be adversely affected by changes in interest rates, underperformance of the underlying assets, the creditworthiness of the entities that provide any supporting letters of credit, surety bonds, or other credit or liquidity enhancements. In addition, most asset-backed securities are subject to prepayment risk in a declining interest rate environment, and extension risk in an increasing interest rate environment.

Janus Henderson Securitized Income ETF | Commercial Mortgage-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Commercial Mortgage-Backed Securities Risk. CMBS are not backed by the full faith and credit of the U.S. Government and are subject to risk of default on the underlying mortgages, particularly during periods of economic downturn. CMBS issued by non-government entities may offer higher yields than those issued by government entities, but also may be subject to greater volatility than government issues. CMBS are subject to a greater degree of prepayment and extension risk than many other forms of fixed-income securities and therefore react differently to changes in interest rates than other bonds, and the prices of CMBS may reflect adverse economic and market conditions.

Janus Henderson Securitized Income ETF | Mortgage-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Mortgage-Backed Securities Risk. MBS are classified generally as either commercial mortgage-backed securities or residential mortgage-backed securities, each of which is subject to certain specific risks. MBS may be more sensitive to changes in interest rates than other types of debt securities. Investments in MBS are subject to both extension risk and prepayment risk. These risks may reduce the Fund’s returns. In addition, investments in MBS, including those comprised of subprime mortgages, may be subject to a higher degree of credit risk, valuation risk, and liquidity risk than various other types of fixed-income securities.

Janus Henderson Securitized Income ETF | Non-Agency Mortgage-Related Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Non-Agency Mortgage-Related Securities Risk. Non-agency mortgage-related securities may not be subject to the same underwriting requirements for the underlying mortgages that are applicable to those mortgage-related securities that have a government or government-sponsored entity guarantee. As a result, the mortgage loans underlying non-agency mortgage-related securities may, and frequently do, have less favorable collateral, credit risk, or other underwriting characteristics than government or government-sponsored mortgage-related securities and have wider variances in a number of terms including interest rate, term, size, purpose, and borrower characteristics. The risk of nonpayment is greater for mortgage-related securities that are backed by loans that were originated under weak underwriting standards, including loans made to borrowers with limited means to make repayment. A level of risk exists for all loans, although, historically, the poorest performing loans have been those classified as subprime. “Subprime” loans are loans made to borrowers with lower credit ratings and/or a shorter credit history, who are more likely to default on their loan obligations as compared to more credit-worthy borrowers. Non-agency mortgage-related securities are not traded on an exchange. There may be a limited market for the securities, especially when there is a perceived weakness in the mortgage and real estate market sectors. Without an active trading market, mortgage-related securities held in the Fund’s portfolio may be particularly difficult to value because of the complexities involved in assessing the value of the underlying mortgage loans.

Janus Henderson Securitized Income ETF | Agency Mortgage-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Agency Mortgage-Backed Securities Risk. Certain Agency mortgage-backed securities issued or guaranteed by agencies of the U.S. Government are guaranteed as to the payment of principal and interest by the relevant entity but have not been backed by the full faith and credit of the U.S. Government. Instead, they have been supported only by the discretionary authority of the U.S. Government to purchase the agency’s obligations. An event affecting the guaranteeing entity could adversely affect the payment of principal or interest or both on the security and, therefore, these types of securities should be considered to be riskier than U.S. Government securities.

Janus Henderson Securitized Income ETF | CLO Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Risk. The risks of investing in CLOs include both the economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments. The degree of such risk will generally correspond to the specific tranche in which the Fund is invested. The Fund may invest in tranches of CLOs that are subordinate to other senior rated CLO tranches (such as AAA rated tranches). However, these ratings do not constitute a guarantee, may be downgraded in stressed market environments, and it is possible that even the most senior CLO tranches could experience losses due to actual defaults, increased sensitivity to defaults due to collateral default and the significant losses experienced by subordinated/equity tranches, market anticipation of defaults, as well as negative market sentiment with respect to CLO securities as an asset class. The Fund’s portfolio management may not be able to accurately predict how specific CLOs or the portfolio of underlying loans for such CLOs will react to changes or stresses in the market, including changes in interest rates. The most common risks associated with investing in CLOs are liquidity risk, interest rate risk, credit risk, prepayment risk, and the risk of default by the underlying assets, among others.

Janus Henderson Securitized Income ETF | CLO Manager Risk  
Prospectus [Line Items]  
Risk [Text Block]

CLO Manager Risk. CLOs are managed by investment advisers independent of the Adviser. CLO managers are responsible for selecting, managing and replacing the underlying bank loans within a CLO. As such, each CLO is subject to poor selections by its CLO manager. Adverse security selection by a CLO manager may cause a CLO to experience difficulty in making its stipulated distribution payments to investors because of the poor performance of the underlying bank loans: (i) entering into bankruptcy proceedings; and/or (ii) are in default as to the repayment of their loan balances. Generally, CLO managers mitigate these risks by maintaining a pool of underlying bank loans in excess of the minimum necessary to finance a CLO’s stipulated distribution payments.

 

In addition, CLO managers may have limited operating histories, may be subject to conflicts of interests, including managing the assets of other clients or other investment vehicles, or receiving fees that incentivize maximizing the yield, and indirectly the risk, of a CLO. Adverse developments with respect to a CLO manager, such as personnel and resource constraints, regulatory issues or other developments that may impact the ability and/or performance of the CLO manager, may adversely impact the performance of the CLO securities in which the Fund invests.

Janus Henderson Securitized Income ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Fixed-Income Securities Risk. Fixed-income securities are generally subject to the following risks:

 

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Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

 

●

Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

●

Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

●

Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

●

Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

●

Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).

Janus Henderson Securitized Income ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson Securitized Income ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Securitized Income ETF | Rule 144A Securities and Other Exempt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A under the Securities Act of 1933 (the “Securities Act”) and other securities exempt from certain registration requirements, could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at

advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Securitized Income ETF | Affiliated Underlying Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

Affiliated Underlying Fund Risk. The Adviser may invest in certain affiliated ETFs as investments for the Fund. The Adviser will generally receive fees for managing such funds, in addition to the fees paid to the Adviser by the Fund. The payment of such fees by affiliated funds creates a conflict of interest when selecting affiliated funds for investment in the Fund. The Adviser, however, is a fiduciary to the Fund and its shareholders and is legally obligated to act in its best interest when selecting affiliated funds. In addition, the Adviser has contractually agreed to waive and/or reimburse a portion of the Fund’s management fee in an amount equal to the management fee it earns as an investment adviser to any of the affiliated ETFs with respect to the Fund’s investment in such ETF, less certain operating expenses.

Janus Henderson Securitized Income ETF | High-Yield Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

High-Yield Bond Risk. High-yield bonds (also known as “junk” bonds) are considered speculative and may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the entity that issued the bond, which may adversely affect their value. High-yield bonds are bonds rated below investment grade by Nationally Recognized Statistical Rating Organizations (“NRSROs”) or are unrated bonds of similar quality. The value of lower quality bonds generally is more dependent on credit risk than investment grade bonds. Issuers of high-yield bonds may not be as strong financially as those issuing bonds with higher credit ratings and are more vulnerable to real or perceived economic changes, political changes, or adverse developments specific to the issuer. In addition, the junk bond market can experience sudden and sharp price swings.

Janus Henderson Securitized Income ETF | Leverage Risk  
Prospectus [Line Items]  
Risk [Text Block]

Leverage Risk. The risk associated with certain types of leveraged investments or trading strategies pursuant to which relatively small market movements may result in large changes in the value of an investment. The Fund creates leverage by investing in instruments where the investment loss can exceed the original amount invested. The use of other investment techniques, such as short sales and certain derivative transactions, can create a leveraging effect on the Fund.

Janus Henderson Securitized Income ETF | TBA Commitments Risk  
Prospectus [Line Items]  
Risk [Text Block]

TBA Commitments Risk. The Fund will typically enter into “to be announced” or “TBA” commitments for MBS and, at times, the portion of the Fund’s portfolio allocated to TBA securities may be significant. Although TBA securities must meet industry-accepted “good delivery” standards, there can be no assurance that a security purchased on a forward commitment basis will ultimately be issued or delivered by the counterparty. During the settlement period, the Fund will still bear the risk of any decline in the value of the security to be delivered. Because TBA commitments do not require the purchase and sale of identical securities, the characteristics of the security delivered to the Fund may be less favorable than the security delivered to the dealer. If the counterparty to a transaction fails to deliver the securities, the Fund could suffer a loss. At the time of its acquisition, a TBA security may be valued at less than the purchase price. When the Fund sells a TBA security prior to settlement, it does not participate in future gains or losses with respect to the security. The Fund is generally not required to pay for the TBA security until the settlement date and, as a result, if the Fund remains substantially fully invested at a time when TBA commitment purchases are outstanding, the purchases may result in a form of leverage.

Janus Henderson Securitized Income ETF | Credit Risk Transfer Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Credit Risk Transfer Securities Risk. CRTs are unguaranteed and unsecured debt securities that are commonly issued by a government sponsored entity. CRTs are not directly linked to or backed by the underlying mortgage loans, so investors such as the Fund have no direct recourse to the underlying mortgage loans in the event of a default. The risks associated with CRTs are different from the risks associated with investments in MBS issued by government sponsored entities or private issuers because some or all of the mortgage default or credit risk associated with the underlying mortgage loans is transferred to investors who hold CRTs. Additional risks associated with investments in CRTs may include valuation risk, credit risk, liquidity risk, and prepayment risk.

Janus Henderson Securitized Income ETF | Collateralized Mortgage Obligation Risk  
Prospectus [Line Items]  
Risk [Text Block]

Collateralized Mortgage Obligation Risk. CMOs are a type of mortgage-backed security. CMOs are created by dividing the principal and interest payments collected on a pool of mortgages into several revenue streams (tranches) with different priority rights to portions of the underlying mortgage payments. Certain CMO tranches may represent a right to receive interest only (“IOs”), principal only (“POs”) or an amount that remains after floating-rate tranches are paid (an inverse floater). These securities are frequently referred to as “mortgage derivatives” and may be extremely sensitive to changes in interest rates. Interest rates on inverse floaters, for example, vary inversely with a short-term floating rate (which may be reset periodically). Interest rates on inverse floaters will decrease when short-term rates increase, and will increase when short-term rates decrease. These securities have the effect of providing a degree of investment leverage. In response to changes in market interest rates or other market conditions, the value of an inverse floater may increase or decrease at a multiple of the increase

or decrease in the value of the underlying securities. If the Fund invests in CMO tranches (including CMO tranches issued by government agencies) and interest rates move in a manner not anticipated by the Adviser, it is possible that the Fund could lose all or substantially all of its investment.

Janus Henderson Securitized Income ETF | Mortgage Dollar Rolls Risk  
Prospectus [Line Items]  
Risk [Text Block]

Mortgage Dollar Rolls Risk. Mortgage dollar roll transactions involve the risk that the market value of the securities sold by the Fund may decline below the repurchase price of those securities. Since the counterparty in the transaction is required to deliver a similar, but not identical, security to the Fund, the security the Fund is required to buy under the mortgage dollar roll may be worth less than an identical security. These transactions involve the risk that portfolio management may not correctly predict mortgage prepayments and interest rates, which may diminish the Fund’s performance. In addition, mortgage dollar roll transactions may increase the Fund’s portfolio turnover rate, which can increase the Fund’s expenses and decrease returns.

Janus Henderson Securitized Income ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Securitized Income ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Securitized Income ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block] Nondiversification Risk. The Fund is classified as nondiversified under the Investment Company Act of 1940, as amended (the “1940 Act”). This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s NAV and total return.
Janus Henderson Short Duration Income ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Short Duration Income ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Short Duration Income ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. Although the Fund does not concentrate its investments in specific industries, it may have a significant portion of its assets invested in securities of companies conducting similar business or businesses within the same economic sector. Companies in the same industry or economic sector may be similarly affected by negative economic or market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. As the Fund’s holdings change over time, the Fund’s exposure to a particular economic sector may fluctuate.

 

 

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Financial Services Sector Risk. To the extent the Fund invests its assets in the financial services sector, the Fund will have exposure to the risks inherent to the financial services sector. Financial services companies may be adversely affected by changes in regulatory framework or interest rates that may negatively affect financial services businesses; exposure of a financial institution to a nondiversified or concentrated loan portfolio; exposure to financial leverage and/or investments or agreements that, under certain circumstances, may lead to losses; and the risk that a market shock or other unexpected market, economic, political, regulatory, or other event might lead to a sudden decline in the values of most or all financial services companies.

Janus Henderson Short Duration Income ETF | Foreign Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Foreign Exposure Risk. Foreign markets, including emerging markets, can be more volatile than the U.S. market. As a result, the Fund’s returns and NAV may be affected by fluctuations in currency exchange rates or political or economic conditions in a particular country. Investments in foreign securities, particularly those of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio. To the extent the Fund invests in foreign debt securities, such investments are sensitive to changes in interest rates. Additionally, investments in securities of foreign governments involve the risk that a foreign government may not be willing or able to pay interest or repay principal when due. The Fund’s investments may be denominated in foreign currencies and therefore, changes in the value of a country’s currency compared to the U.S. dollar may affect the value of the Fund’s investments.

Janus Henderson Short Duration Income ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Short Duration Income ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Cash Transaction Risk. To the extent the Fund sells portfolio securities to meet some or all of a redemption request with cash, the Fund may incur taxable gains or losses that it might not have incurred had it made redemptions entirely in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

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Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Short Duration Income ETF | Asset-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Asset-Backed Securities Risk. Asset-backed securities may be adversely affected by changes in interest rates, underperformance of the underlying assets, the creditworthiness of the entities that provide any supporting letters of credit, surety bonds, or other credit or liquidity enhancements. In addition, most asset-backed securities are subject to prepayment risk in a declining interest rate environment, and extension risk in an increasing interest rate environment.

Janus Henderson Short Duration Income ETF | Mortgage-Backed Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Mortgage-Backed Securities Risk. Mortgage-backed securities are classified generally as either commercial mortgage-backed securities or residential mortgage-backed securities, each of which is subject to certain specific risks. Mortgage-backed securities tend to be more sensitive to changes in interest rates than other types of debt securities. These risks may reduce the Fund’s returns. In addition, investments in mortgage-backed securities, including those comprised of subprime mortgages, may be subject to a higher degree of credit risk, valuation risk, and liquidity risk than various other types of fixed-income securities.

Janus Henderson Short Duration Income ETF | Fixed-Income Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Fixed-Income Securities Risk. Fixed-income securities are generally subject to the following risks:

 

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Interest rate risk, which is the risk that prices of bonds and other fixed-income securities will increase as interest rates fall and decrease as interest rates rise. Changing interest rates have unpredictable effects on the markets and may expose fixed-income and related markets to heightened volatility.

 

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Credit risk, which is the risk that the credit strength of an issuer of a fixed-income security will weaken and/or that the issuer will be unable to make timely principal and interest payments and that the security may go into default.

 

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Prepayment risk, which is the risk that, during periods of falling interest rates, certain debt obligations may be paid off quicker than originally anticipated, which may cause the Fund to reinvest its assets in securities with lower yields, resulting in a decline in the Fund’s income or return potential.

 

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Valuation risk, which is the risk that one or more of the fixed-income securities in which the Fund invests are priced differently than the value realized upon such security’s sale. In times of market instability, valuation may be more difficult. Valuation may also be affected by changes in the issuer’s financial strength, the market’s perception of such strength, or in the credit rating of the issuer or the security.

 

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Extension risk, which is the risk that, during periods of rising interest rates, certain debt obligations may be paid off substantially slower than originally anticipated, and as a result, the value of those obligations may fall.

 

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Liquidity risk, which is the risk that fixed-income securities may be difficult or impossible to sell at the time that portfolio management would like or at the price portfolio management believes the security is currently worth. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment

opportunity, any of which could have a negative effect on the Fund’s performance. In unusual market conditions, even normally liquid securities may be affected by a degree of liquidity risk (i.e., if the number and capacity of traditional market participants is reduced).

Janus Henderson Short Duration Income ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson Short Duration Income ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson Short Duration Income ETF | Floating Rate Obligations Risk  
Prospectus [Line Items]  
Risk [Text Block]

Floating Rate Obligations Risk. The Fund may invest in floating rate obligations with interest rates that reset regularly, maintaining a fixed spread over a stated reference rate. The interest rates on floating rate obligations typically reset quarterly, although rates on some obligations may adjust at other intervals. Unexpected changes in the interest rates on floating rate obligations could result in lower income to the Fund. In addition, the secondary market on which floating rate obligations are traded may be less liquid than the market for investment grade securities or other types of income-producing securities, which may have an adverse impact on their market price. There is also a potential that there is no active market to trade floating rate obligations, that there may be restrictions on their transfer, or that the issuer may default. As a result, the Fund may be unable to sell floating rate obligations at the desired time or may be able to sell only at a price less than fair market value.

Janus Henderson Short Duration Income ETF | Rule 144A Securities and Other Exempt Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Rule 144A Securities and Other Exempt Securities Risk. Investments in securities issued under Regulation S and Rule 144A under the Securities Act of 1933 (the “Securities Act”) and other securities exempt from certain registration requirements, could have the effect of decreasing the Fund’s liquidity profile or preventing the Fund from disposing of them promptly at advantageous prices. Investments in securities exempt from certain registration requirements may be less liquid than other investments because such securities may not always be readily sold in broad public markets and may have no active trading market. As a result, they may be difficult to value because market quotations may not be readily available.

Janus Henderson Short Duration Income ETF | Corporate Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

Corporate Bond Risk. The investment return of corporate bonds reflects interest earned on the security and changes in the market value of the security. The market value of a corporate bond may be affected by changes in interest rates, the credit rating of the corporation, the corporation’s performance and perceptions of the corporation in the marketplace. The market value of a corporate bond generally may be expected to rise and fall inversely with interest rates. The market value of intermediate and longer-term corporate bonds is generally more sensitive to changes in interest rates than is the market value of shorter-term corporate bonds. Corporate bonds are also subject to the credit risk of the issuer, as the issuer of corporate bonds may not be able to meet their obligations on interest or principal payments at the time called for by an instrument.

Janus Henderson Short Duration Income ETF | High-Yield Bond Risk  
Prospectus [Line Items]  
Risk [Text Block]

High-Yield Bond Risk. High-yield bonds (also known as “junk” bonds) are considered speculative and may be more sensitive than other types of bonds to economic changes, political changes, or adverse developments specific to the entity that issued the bond, which may adversely affect their value.

Janus Henderson Short Duration Income ETF | Geographic Concentration Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Geographic Concentration Risk. To the extent that the Fund invests a significant portion of its assets in a particular country or geographic region, the Fund will generally have more exposure to certain risks due to possible political, economic, social, or regulatory events in that country or region. Adverse developments in certain regions could also adversely affect securities of other countries whose economies appear to be unrelated and could have a negative impact on the Fund’s performance.

 

 

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Australia Risk. The Fund’s investment in Australian issuers may subject the Fund to loss in the event of adverse tax, political, economic, regulatory, and other developments that affect Australia and its fixed-income markets, including fluctuations of Australian currency versus the U.S. dollar. Also, Australia is economically sensitive to environmental events and is located in a part of the world that has historically been prone to natural disasters, such as drought and flooding.

Janus Henderson Short Duration Income ETF | Sovereign Debt Risk  
Prospectus [Line Items]  
Risk [Text Block]

Sovereign Debt Risk. The Fund may invest in U.S. and foreign government debt securities (“sovereign debt”). Investments in U.S. sovereign debt are considered relatively low risk. However, investments in foreign sovereign debt can involve a high degree of risk, including the risk that the governmental entity that controls the repayment of sovereign debt may not be willing or able to repay the principal and/or to pay the interest on its sovereign debt in a timely manner. A sovereign debtor’s willingness or ability to satisfy its debt obligation may be affected by various factors including, but not limited to, its cash flow situation, the extent of its foreign currency reserves, the availability of foreign exchange when a payment is due, and the relative size of its debt position in relation to its economy as a whole. In the event of default, there may be limited or no legal remedies for collecting sovereign debt and there may be no bankruptcy proceedings through which the Fund may collect all or part of the sovereign debt that a governmental entity has not repaid. In addition, to the extent the Fund invests in foreign sovereign debt it may be subject to currency risk.

Janus Henderson Short Duration Income ETF | Not a Money Market Fund  
Prospectus [Line Items]  
Risk [Text Block]

Not a Money Market Fund. The Fund is not a money market fund and is not subject to the rules that govern the quality, maturity, liquidity and other features of securities that money market funds may purchase. Under normal circumstances, the Fund’s investments may be more susceptible to credit risk, interest rate risk, valuation risk and other risks compared to a money market fund. The Fund does not seek to maintain a stable NAV of $1.00 per share.

Janus Henderson Short Duration Income ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Short Duration Income ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Global Artificial Intelligence ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s NAV may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Global Artificial Intelligence ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies and research process employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Global Artificial Intelligence ETF | Equity Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The value of the Fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases. Further, regardless of how well individual companies or securities perform, the value of the Fund’s portfolio could also decrease if there are deteriorating economic or market conditions or perceptions regarding the industries which the issuers of securities the Fund holds participate.

Janus Henderson Global Artificial Intelligence ETF | Growth Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Growth Securities Risk. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If portfolio management’s perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Fund’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from other types of securities and the market as a whole.

Janus Henderson Global Artificial Intelligence ETF | Issuer Concentration Risk  
Prospectus [Line Items]  
Risk [Text Block]

Issuer Concentration Risk. The Fund’s portfolio may be comprised of a relatively small number of issuers in comparison to other funds. As a result, the Fund may be subject to greater risks than a fund that invests in a greater number of issuers. A change in the value of any single investment held by the Fund may affect the overall value of the Fund more than it would affect a fund that holds more investments. In particular, the Fund may be more susceptible to adverse developments affecting any single issuer held by the Fund and may be susceptible to greater losses because of these developments. The Fund’s policy of concentrating its portfolio on a smaller number of holdings could result in more volatility in the Fund’s performance and share price.

Janus Henderson Global Artificial Intelligence ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. The Fund invests a significant portion of its assets invested in securities of companies conducting similar business or business within the same economic sector. Companies in the same industry or economic sector may be similarly affected by negative economic or market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility.

 

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Technology Sector Risk. In the technology sector, competitive pressures may have a significant effect on the performance of companies in which the Fund may invest. In addition, technology and technology-related companies often progress at an accelerated rate, and these companies may be subject to short product cycles and aggressive pricing, which may increase their volatility.

Janus Henderson Global Artificial Intelligence ETF | Large-Sized Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]

Large-Sized Companies Risk. Large-sized companies may be less able than smaller-sized companies to adapt to changing market conditions. Large-sized companies may be more mature and subject to more limited growth potential compared with smaller sized companies. During different market cycles, the performance of large-sized companies has trailed the overall performance of the broader securities markets.

Janus Henderson Global Artificial Intelligence ETF | Small- and Mid-Sized Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]

Small and Mid-Sized Companies Risk. The Fund’s investments in securities issued by small and mid-sized companies, which can include smaller companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. Securities issued by small and mid-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger and more established companies. These holdings are also subject to wider price fluctuations and tend to be less liquid than stocks of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as the market conditions change.

Janus Henderson Global Artificial Intelligence ETF | Foreign Exposure Risk  
Prospectus [Line Items]  
Risk [Text Block]

Foreign Exposure Risk. Foreign markets can be more volatile than the U.S. market. As a result, the Fund’s returns and NAV may be affected by fluctuations in currency exchange rates or political or economic conditions in a particular country. Investments in foreign securities, particularly those of issuers located in emerging market countries, tend to have greater exposure to liquidity risk than domestic securities. In some foreign markets, there may not be protection against failure by other parties to complete transactions. It may not be possible for the Fund to repatriate capital, dividends, interest, and other income from a particular country or governmental entity. In addition, a market swing in one or more countries or regions where the Fund has invested a significant amount of its assets may have a greater effect on the Fund’s performance than it would in a more geographically diversified portfolio.

Janus Henderson Global Artificial Intelligence ETF | Emerging Markets Risk  
Prospectus [Line Items]  
Risk [Text Block]

Emerging Markets Risk. Emerging market securities involve a number of risks, which may result from less government supervision and regulation of business and industry practices (including the potential lack of strict finance and accounting controls and standards), stock exchanges, brokers, and listed companies. Information about emerging market companies, including financial information, may be less available or reliable and the Adviser’s ability to conduct due diligence with respect to such companies may be limited. Accordingly, these investments may be potentially more volatile in price and less liquid than investments in developed securities markets, resulting in greater risk to investors. There is a risk in developing countries that a current or future economic or political crisis could lead to price controls, forced mergers of companies, expropriation or confiscatory taxation, imposition or enforcement of foreign ownership limits, seizure, nationalization, sanctions or imposition of restrictions by various governmental entities on investment and trading, or creation of government monopolies, any of which may have a detrimental effect on the Fund’s investments. In addition, the taxation systems at the federal, regional, and local levels in developing or emerging market countries may be less transparent, inconsistently enforced, and subject to change. Emerging markets may be subject to a higher degree of corruption and fraud than developed markets, and financial institutions and transaction counterparties may have less financial sophistication, creditworthiness, and/or resources than participants in developed markets.

Janus Henderson Global Artificial Intelligence ETF | Depositary Receipts Risk  
Prospectus [Line Items]  
Risk [Text Block]

Depositary Receipts Risk. Depositary receipts are generally subject to the same sort of risks as direct investments in a foreign country, such as currency risk, market risk, and foreign exposure risk, because their values depend on the performance of a foreign security denominated in its home currency.

Janus Henderson Global Artificial Intelligence ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Global Artificial Intelligence ETF | New/Smaller Sized Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

New/Smaller Sized Fund Risk. Because the Fund is relatively new, it has a limited operating history and a small asset base. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term if and when it becomes larger. If a new or smaller fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the Fund and tax consequences for investors.

Janus Henderson Global Artificial Intelligence ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from The Nasdaq Stock Market, LLC (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Global Artificial Intelligence ETF | Artificial Intelligence Investing Risk  
Prospectus [Line Items]  
Risk [Text Block]

Artificial Intelligence Investing Risk. Artificial intelligence companies that contribute to or benefit from artificial intelligence technologies (“Artificial Intelligence Companies”) face intense competition and potentially rapid product obsolescence, and many depend significantly on retaining and growing the consumer base of their respective products and services. Artificial

Intelligence Companies may be substantially exposed to market risk generally, and risks of other industries or sectors specifically, and the Fund may be adversely affected by negative developments impacting Artificial Intelligence Companies, and related industries or sectors.

 

Artificial Intelligence Companies are heavily dependent on intellectual property rights and may be adversely affected by loss or impairment of those rights.

 

Artificial Intelligence Companies may utilize artificial intelligence in their own business operations; such companies’ use of artificial intelligence could result in reputational harm, competitive harm, and legal liability, and/or have an adverse effect on such companies’ business operations and Artificial Intelligence Companies as a whole.

 

Artificial intelligence technologies and the use of such technology could face increasing regulatory scrutiny in the future, which may limit the development of this technology and impede the growth of Artificial Intelligence Companies.

 

Artificial Intelligence Companies typically engage in significant amounts of spending on research and development, and there is no guarantee that the products or services produced by these companies will be successful. Securities of Artificial Intelligence Companies, especially smaller companies, tend to be more volatile than those of companies that have a more developed set of product and/or service offerings.

Janus Henderson Global Artificial Intelligence ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Global Artificial Intelligence ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Global Artificial Intelligence ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Nondiversification Risk. The Fund is classified as nondiversified under the Investment Company Act of 1940, as amended (the “1940 Act”). This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s NAV and total return.

Janus Henderson U.S. Real Estate ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s NAV may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson U.S. Real Estate ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson U.S. Real Estate ETF | Issuer Concentration Risk  
Prospectus [Line Items]  
Risk [Text Block]

Issuer Concentration Risk. The Fund’s portfolio may be comprised of a relatively small number of issuers in comparison to other funds. As a result, the Fund may be subject to greater risks than a fund that invests in a greater number of issuers. A change in the value of any single investment held by the Fund may affect the overall value of the Fund more than it would affect a fund that holds more investments. In particular, the Fund may be more susceptible to adverse developments affecting any single issuer held by the Fund and may be susceptible to greater losses because of these developments. The Fund’s policy of concentrating its portfolio on a smaller number of holdings could result in more volatility in the Fund’s performance and share price.

Janus Henderson U.S. Real Estate ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. The Fund invests a significant portion of its assets invested in securities of companies conducting similar business, or business within the same economic sector. Companies in the same industry or economic sector may be similarly affected by economic or market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. In addition, the Fund may be overweight or underweight in certain industries or sectors relative to its performance benchmark index, which may cause the Fund’s performance to be more or less sensitive to developments affecting those sectors.

 

 

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Real Estate Sector Risk. Investments in securities of these companies are subject to the risks associated with fluctuations in the value of the underlying properties; defaults by borrowers or tenants; market saturation; changes in general and local economic conditions; decreases in market rates for rents; changes in the availability, cost, and terms of mortgage funds; increased competition, property taxes, capital expenditures, or operating expenses; and other economic, political, or regulatory occurrences, including the impact of changes in environmental laws. In addition, a REIT could fail to qualify for tax-free pass-through of its income under the Internal Revenue Code of 1986, as amended, or fail to maintain its exemption from registration under the Investment Company Act of 1940, as amended (the “1940 Act”), which could produce adverse economic consequences for the REIT and its investors, including the Fund. Dividends received by the Fund from a REIT generally will not constitute qualified dividend income. The real estate sector is particularly sensitive to economic downturns and changes to interest rates. The ability to trade companies operating in real estate development and operations in the secondary market can be more limited compared to other equity investments, and certain REITs and REIT-like entities have relatively small market capitalizations, which can increase the volatility of the market price for their securities.

Janus Henderson U.S. Real Estate ETF | Large-Sized Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]

Large-Sized Companies Risk. Large-sized companies may be less able than smaller-sized companies to adapt to changing market conditions. Large-sized companies may be more mature and subject to more limited growth potential compared with smaller sized companies. During different market cycles, the performance of large-sized companies has trailed the overall performance of the broader securities markets.

Janus Henderson U.S. Real Estate ETF | Small- and Mid-Sized Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]

Small- and Mid-Sized Companies Risk. Investments in securities issued by small- and mid-sized companies, which can include smaller companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. Securities issued by small- and mid-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger or more established companies. These holdings are also subject to wider price fluctuations and tend to be less liquid than stocks of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as the market conditions change.

Janus Henderson U.S. Real Estate ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson U.S. Real Estate ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

●

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from the NYSE Arca, Inc. (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

●

Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

●

Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson U.S. Real Estate ETF | Derivatives Risk  
Prospectus [Line Items]  
Risk [Text Block]

Derivatives Risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. The Fund’s use of derivatives instruments could reduce the Fund’s performance, increase its volatility, and cause the Fund to lose more than the initial amount invested.

 

In addition, investments in derivatives may involve leverage, which means a small percentage of assets invested in derivatives can have a disproportionately large impact on the Fund’s performance. Moreover, although the value of a derivative instrument is based on an underlying reference asset or index, a derivative instrument typically does not carry the same rights as would be the case if the Fund invested directly in an underlying reference asset.

Janus Henderson U.S. Real Estate ETF | Counterparty Risk  
Prospectus [Line Items]  
Risk [Text Block]

Counterparty Risk. Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not. A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund. The Fund may be unable to recover its investment from the counterparty or may obtain a limited recovery, and/or recovery may be delayed.

Janus Henderson U.S. Real Estate ETF | Smaller Sized Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

Smaller Sized Fund Risk. Because the Fund has a small asset base, large inflows and outflows may have a disproportionate impact, negative or positive, on the Fund’ performance, which may be more volatile than that of a larger fund. If a smaller fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the Fund and tax consequences for investors.

Janus Henderson U.S. Real Estate ETF | Initial Public Offering Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Initial Public Offering Risk. The Fund’s purchase of shares issued in an initial public offering (“IPO”) exposes it to the risks associated with companies that have little operating history as public companies, as well as to the risks inherent in those sectors of the market where these new issuers operate. There can be no assurance that the Fund will identify favorable IPO investment opportunities in the future. In addition, as the Fund increases in size, the impact of IPOs on the Fund’s performance will generally decrease.

Janus Henderson U.S. Real Estate ETF | E S G Investment Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]

ESG Investment Risk. Because the Fund considers ESG Factors in selecting securities, the Fund may perform differently than funds that do not consider ESG Factors. Due to the ESG considerations and exclusionary criteria employed by the Fund, the Fund may not be invested in certain issuers within the real estate industry or real estate-related industries, and therefore may have lower performance than portfolios that do not apply similar criteria. ESG-related information provided by issuers and third parties, which portfolio management may utilize, continues to develop, and may be incomplete, inaccurate, use different methodologies, or be applied differently across companies and industries. Further, the regulatory landscape for ESG investing in the United States is still developing and future rules and regulations may require the Fund to modify or alter its investment process. Similarly, government policies incentivizing companies to consider their environmental or social practices may fall out of favor, which could potentially limit the Fund’s investment universe. There is also a risk that the issuers identified through the investment process employed by the Fund may fail to adhere to positive environmental or social practices, which may result in selling a security when it might otherwise be disadvantageous to do so.

Janus Henderson U.S. Real Estate ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns will vary, and you could lose money.
Janus Henderson U.S. Real Estate ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block]

An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Janus Henderson U.S. Real Estate ETF | Risk Nondiversified Status [Member]  
Prospectus [Line Items]  
Risk [Text Block]

Nondiversification Risk. The Fund is classified as nondiversified under the 1940 Act, as amended. This gives the Fund’s portfolio management more flexibility to hold larger positions in securities than a fund that is classified as diversified. As a result, an increase or decrease in the value of a single security held by the Fund may have a greater impact on the Fund’s net asset value (“NAV”) and total return.

Janus Henderson Mid Cap Growth Alpha ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic, and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Mid Cap Growth Alpha ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Mid Cap Growth Alpha ETF | Equity Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The value of the Fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases. Further, regardless of how well individual companies or securities perform, the value of the Fund’s portfolio could also decrease if there are deteriorating economic or market conditions or perceptions regarding the industries in which the issuers of securities the Fund holds participate.

Janus Henderson Mid Cap Growth Alpha ETF | Growth Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Growth Securities Risk. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If portfolio management’s perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Fund’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from other types of securities and the market as a whole.

Janus Henderson Mid Cap Growth Alpha ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. The Fund will not invest more than 25% of the value of its total assets in the securities of companies within the same industry, except that, to the extent that an industry represents 20% or more of the Fund’s benchmark at the time of investment, the Fund may invest up to 35% of its assets in that industry. The Fund may have a significant portion of its assets invested in securities of companies conducting similar business or businesses within the same economic sector. Companies in the same industry or economic sector may be similarly affected by negative economic or

market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. As the Fund’s holdings change over time, the Fund’s exposure to a particular economic sector may fluctuate.

 

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Consumer Discretionary Sector Risk. Consumer product manufacturers and retailers are tied closely to the performance of the overall global economy, interest rates, and consumer confidence. Consumer product manufacturers and retailers depend heavily on disposable household income and discretionary consumer spending. Also, individual companies in the consumer discretionary sector are subject to intense competition, which may have a negative impact on their respective profitability. In addition, changes in demographics and consumer tastes can also negatively affect the demand for goods and services of companies in the consumer discretionary sector.

 

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Healthcare Sector Risk. Companies in the healthcare sector may be adversely affected by extensive government regulation restrictions on government reimbursement for medical expenses, rising costs of medical products, services and facilities, pricing pressure, an increased emphasis on outpatient services, a limited number of products, industry innovation, costs associated with obtaining and protecting patents, product liability and other claims, changes in technologies and other market developments.

 

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Industrials Sector Risk. The industrials sector is comprised of companies that produce capital goods used in construction and manufacturing, such as companies that make and sell machinery, equipment and supplies that are used to produce other goods. Companies in the industrials sector may be adversely affected by changes in government regulation and spending, import controls, and worldwide competition. In addition, companies may be adversely affected by environmental damages, product liability claims and exchange rates, and may face product obsolescence due to rapid technological developments and frequent new product introduction.

Janus Henderson Mid Cap Growth Alpha ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Mid Cap Growth Alpha ETF | New/Smaller Sized Fund Risk  
Prospectus [Line Items]  
Risk [Text Block]

New/Smaller Sized Fund Risk. Because the Fund is relatively new, it has a limited operating history and a small asset base. The Fund’s performance may not represent how the Fund is expected to or may perform in the long term if and when it becomes larger. If the Fund were to fail to attract sufficient assets to achieve or maintain economies of scale, performance may be negatively impacted, and any resulting liquidation could create negative transaction costs for the fund and tax consequences for investors.

Janus Henderson Mid Cap Growth Alpha ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

●

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from The Nasdaq Stock Market, LLC (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

●

Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

●

Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Mid Cap Growth Alpha ETF | Portfolio Turnover Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Turnover Risk. Increased portfolio turnover may result in higher costs which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders.

Janus Henderson Mid Cap Growth Alpha ETF | Mid-Sized Companies Risk.  
Prospectus [Line Items]  
Risk [Text Block]

Mid-Sized Companies Risk. Investments in securities issued by mid-sized companies may involve greater risks than are customarily associated with larger, more established companies. Securities issued by mid-sized companies tend to be more volatile than securities issued by larger or more established companies and may underperform as compared to the securities of larger or more established companies. These holdings are also subject to wider price fluctuations and tend to be less liquid than stocks of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as market conditions change.

Janus Henderson Mid Cap Growth Alpha ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns and yields will vary, and you could lose money.
Janus Henderson Mid Cap Growth Alpha ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Small Cap Growth Alpha ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Small Cap Growth Alpha ETF | Portfolio Management Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Small Cap Growth Alpha ETF | Equity Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The value of the Fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases. Further, regardless of how well individual companies or securities perform, the value of the Fund’s portfolio could also decrease if there are deteriorating economic or market conditions or perceptions regarding the industries in which the issuers of securities the Fund holds participate.

Janus Henderson Small Cap Growth Alpha ETF | Growth Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Growth Securities Risk. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If the perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Fund’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from the market as a whole and other types of securities.

Janus Henderson Small Cap Growth Alpha ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. Although the Fund does not concentrate its investments in specific industries, the Fund may have a significant portion of its assets invested in securities of companies conducting similar business or businesses within the same economic sector. Companies in the same industry or economic sector may be similarly affected by negative economic or market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. As the Fund’s holdings change over time, the Fund’s exposure to a particular economic sector may fluctuate.

 

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Healthcare Sector Risk. Companies in the healthcare sector may be adversely affected by extensive government regulation restrictions on government reimbursement for medical expenses, rising costs of medical products, services and facilities, pricing pressure, an increased emphasis on outpatient services, a limited number of products, industry innovation, costs associated with obtaining and protecting patents, product liability and other claims, changes in technologies and other market developments.

 

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Industrials Sector Risk. The industrials sector is comprised of companies who produce capital goods used in construction and manufacturing, such as companies that make and sell machinery, equipment and supplies that are used to produce other goods. Companies in the industrials sector may be adversely affected by changes in government regulation and spending, import controls, and worldwide competition. In addition, companies may be adversely affected by environmental damages, product liability claims and exchange rates, and may face product obsolescence due to rapid technological developments and frequent new product introduction.

 

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Technology Sector Risk. In the technology sector, competitive pressures may have a significant effect on the performance of companies in which the Fund may invest. In addition, technology and technology-related companies often progress at an accelerated rate, and these companies may be subject to short product cycles and aggressive pricing, which may increase their volatility.

Janus Henderson Small Cap Growth Alpha ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Small Cap Growth Alpha ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from The Nasdaq Stock Market, LLC (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

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Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

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Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

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Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Small Cap Growth Alpha ETF | Portfolio Turnover Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Turnover Risk. Increased portfolio turnover may result in higher costs which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders.

Janus Henderson Small Cap Growth Alpha ETF | Small-Sized Companies Risk.  
Prospectus [Line Items]  
Risk [Text Block]

Small-Sized Companies Risk. The Fund’s investments in securities issued by small-sized companies, which can include smaller, start-up companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. Securities issued by small-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger or more established companies. These holding are also subject to wider price fluctuations and tend to be less liquid that stock of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as market conditions change.

Janus Henderson Small Cap Growth Alpha ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns will vary, and you could lose money.
Janus Henderson Small Cap Growth Alpha ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Janus Henderson Small/Mid Cap Growth Alpha ETF | Market Risk  
Prospectus [Line Items]  
Risk [Text Block]

Market Risk. The value of the Fund’s portfolio may decrease due to short-term market movements and over more prolonged market downturns. As a result, the Fund’s net asset value (“NAV”) may decrease. Market risk may affect a single issuer, industry, economic sector, or the market as a whole. Market risk may be magnified if certain social, political, economic and other conditions and events (such as financial institution failures, economic recessions, tariffs, trade disputes, terrorism, war, armed conflicts, including related sanctions, social unrest, natural disasters, and epidemics and pandemics) adversely interrupt the global economy and financial markets. It is important to understand that the value of your investment may fall, sometimes sharply, in response to changes in the market, and you could lose money.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Portfolio Management Risk  
Prospectus [Line Items]  
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Portfolio Management Risk. The Fund is an actively managed investment portfolio and is therefore subject to the risk that the investment strategies employed for the Fund may fail to produce the intended results. Accordingly, the Fund may underperform benchmark indices or other funds with similar investment objectives.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Equity Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Equity Securities Risk. Equity securities are subject to changes in value, and their values may be more volatile than those of other asset classes. The value of the Fund’s portfolio may decrease if the value of an individual company or security, or multiple companies or securities, in the portfolio decreases. Further, regardless of how well individual companies or securities perform, the value of the Fund’s portfolio could also decrease if there are deteriorating economic or market conditions or perceptions regarding the industries in which the issuers of securities the Fund holds participate.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Growth Securities Risk  
Prospectus [Line Items]  
Risk [Text Block]

Growth Securities Risk. Securities of companies perceived to be “growth” companies may be more volatile than other stocks and may involve special risks. If the perception of a company’s growth potential is not realized, the securities purchased may not perform as expected, reducing the Fund’s returns. In addition, because different types of stocks tend to shift in and out of favor depending on market and economic conditions, “growth” stocks may perform differently from the market as a whole and other types of securities.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Industry and Sector Risk  
Prospectus [Line Items]  
Risk [Text Block]

Industry and Sector Risk. Although the Fund does not concentrate its investments in specific industries, the Fund may have a significant portion of its assets invested in securities of companies conducting similar business or businesses within the same economic sector. Companies in the same industry or economic sector may be similarly affected by negative economic or market events, making the Fund more vulnerable to unfavorable developments than funds that invest more broadly. As the Fund’s portfolio becomes more concentrated, the Fund is less able to spread risk and potentially reduce the risk of loss and volatility. As the Fund’s holdings change over time, the Fund’s exposure to a particular economic sector may fluctuate.

 

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Healthcare Sector Risk. Companies in the healthcare sector may be adversely affected by extensive government regulation restrictions on government reimbursement for medical expenses, rising costs of medical products, services and facilities, pricing pressure, an increased emphasis on outpatient services, a limited number of products, industry innovation, costs associated with obtaining and protecting patents, product liability and other claims, changes in technologies and other market developments.

 

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Industrials Sector Risk. The industrials sector is comprised of companies who produce capital goods used in construction and manufacturing, such as companies that make and sell machinery, equipment and supplies that are used to produce other goods. Companies in the industrials sector may be adversely affected by changes in government regulation and spending, import controls, and worldwide competition. In addition, companies may be adversely affected by environmental damages, product liability claims and exchange rates, and may face product obsolescence due to rapid technological developments and frequent new product introduction.

 

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Technology Sector Risk. In the technology sector, competitive pressures may have a significant effect on the performance of companies in which the Fund may invest. In addition, technology and technology-related companies often progress at an accelerated rate, and these companies may be subject to short product cycles and aggressive pricing, which may increase their volatility.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Small- and Mid-Sized Companies Risk  
Prospectus [Line Items]  
Risk [Text Block]

Small- and Mid-Sized Companies Risk. The Fund’s investments in securities issued by small- and mid-sized companies, which can include smaller companies offering emerging products or services, may involve greater risks than are customarily associated with larger, more established companies. Securities issued by small- and mid-sized companies tend to be more volatile and somewhat more speculative than securities issued by larger or more established companies and may underperform as compared to the securities of larger or more established companies. These holding are also subject to wider price fluctuations and tend to be less liquid than stocks of larger or more established companies, which could have a significant adverse effect on the Fund’s returns, especially as market conditions change.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Securities Lending Risk  
Prospectus [Line Items]  
Risk [Text Block]

Securities Lending Risk. Securities lending involves a risk of loss because the borrower may fail to return the securities in a timely manner or at all. If the Fund lends its securities and is unable to recover the securities loaned, it may sell the collateral and purchase a replacement security in the market. Lending securities entails a risk of loss to the Fund if and to the extent that the market value of the loaned securities increases and the collateral is not increased accordingly. Any cash received as collateral for loaned securities will be invested in an affiliated cash management vehicle or time deposits. This investment is subject to market appreciation or depreciation and the Fund will bear any loss on the investment of its cash collateral.

Janus Henderson Small/Mid Cap Growth Alpha ETF | ETF Risks  
Prospectus [Line Items]  
Risk [Text Block]

ETF Risks. The Fund is an ETF, and, as a result of the Fund utilizing an ETF’s structure, it is exposed to the following risks:

 

●

Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). Only APs may engage in creation or redemption transactions directly with the Fund and they have no obligation to submit creation or redemption orders. In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, the Fund’s shares may trade at a material discount to the net asset value (“NAV”) and possibly face delisting from The Nasdaq Stock Market, LLC (the “Exchange”): (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.

 

●

Costs of Buying or Selling Shares. Due to the costs of buying or selling Fund shares, frequent trading of the Fund’s shares may significantly reduce investment results and an investment in the Fund may not be advisable for investors who anticipate regularly making small investments.

 

●

Shares Trade at Prices Other Than NAV. As with all ETFs, the Fund’s shares are bought and sold on the Exchange at market prices. There may be times when the market price of the Fund’s shares is more than the NAV (premium) or less than the NAV (discount) due to supply and demand for the Fund’s shares. This risk is heightened during periods of steep market declines and/or periods when there is limited trading activity for the Fund’s shares on the Exchange.

 

●

Trading. There can be no assurance that the Fund’s shares will trade with any volume, or at all, on the Exchange. There can be no assurance that an active trading market for Fund shares will develop or be maintained. Furthermore, during a “flash crash,” the market prices of the Fund’s shares may decline suddenly and significantly resulting in the Fund’s shares trading at a substantial discount to NAV. Flash crashes may also cause APs and other market makers to limit or cease trading in the Fund’s shares.

 

In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to the Exchange’s “circuit breaker” rules. Shareholders could suffer significant losses to the extent that they sell shares during a flash crash or when the Exchange’s circuit breaker rules are in effect.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Portfolio Turnover Risk  
Prospectus [Line Items]  
Risk [Text Block]

Portfolio Turnover Risk. Increased portfolio turnover may result in higher costs which may have a negative effect on the Fund’s performance. In addition, higher portfolio turnover may result in the acceleration of capital gains and the recognition of greater levels of short-term capital gains, which are taxed at ordinary federal income tax rates when distributed to shareholders.

Janus Henderson Small/Mid Cap Growth Alpha ETF | Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] The biggest risk is that the Fund’s returns will vary, and you could lose money.
Janus Henderson Small/Mid Cap Growth Alpha ETF | Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.