Performance Management |
Feb. 27, 2026 |
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| Janus Henderson Transformational Growth ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The Fund does not have a full calendar year of operations. When provided, the information is designed to offer some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns compare with a broad measure of market performance. Past performance does not necessarily indicate how the Fund will perform in the future. Performance information for certain periods is included in the Fund’s annual and/or semiannual report and is available at janushenderson.com/info or by calling 1-800-668-0434. |
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| Performance Past Does Not Indicate Future [Text] | Past performance does not necessarily indicate how the Fund will perform in the future. | ||||||
| Performance One Year or Less [Text] | The Fund does not have a full calendar year of operations. | ||||||
| Performance Availability Website Address [Text] | janushenderson.com/info | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Asset-Backed Securities ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The Fund does not have a full calendar year of operations. When provided, the information is designed to offer some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns compare with a broad measure of market performance. Past performance does not necessarily indicate how the Fund will perform in the future. Performance information for certain periods is included in the Fund’s annual and/or semiannual report and is available at janushenderson.com/info or by calling 1-800-668-0434. |
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| Performance Past Does Not Indicate Future [Text] | Past performance does not necessarily indicate how the Fund will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | When provided, the information is designed to offer some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns compare with a broad measure of market performance. | ||||||
| Performance Availability Website Address [Text] | janushenderson.com/info | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson AAA CLO ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson AAA CLO ETF | Janus Henderson AAA CLO ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 2.55% | ||||||
| Highest Quarterly Return, Date | Sep. 30, 2023 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (1.75%) | ||||||
| Lowest Quarterly Return, Date | Jun. 30, 2022 | ||||||
| Janus Henderson B-BBB CLO ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Narrative | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
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| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | he after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson B-BBB CLO ETF | Janus Henderson B-BBB CLO ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 5.86% | ||||||
| Highest Quarterly Return, Date | Sep. 30, 2023 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | 0.26% | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2025 | ||||||
| Janus Henderson Corporate Bond ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses. Effective May 13, 2024, the Fund changed its investment strategy. Performance prior to May 13, 2024, reflects the Fund’s former strategy; its performance may have differed if the Fund’s current strategy had been in place.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Corporate Bond ETF | Janus Henderson Corporate Bond ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 9.13% | ||||||
| Highest Quarterly Return, Date | Dec. 31, 2023 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (7.85%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2022 | ||||||
| Janus Henderson Emerging Markets Debt Hard Currency ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Emerging Markets Debt Hard Currency ETF | Janus Henderson Corporate Bond ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 4.40% | ||||||
| Highest Quarterly Return, Date | Sep. 30, 2025 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | 2.21% | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2025 | ||||||
| Janus Henderson Income ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Income ETF | Janus Henderson Corporate Bond ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 2.36% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2025 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | 1.60% | ||||||
| Lowest Quarterly Return, Date | Dec. 31, 2025 | ||||||
| Janus Henderson Mortgage-Backed Securities ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Narrative | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Mortgage-Backed Securities ETF | Janus Henderson Mortgage-Backed Securities ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 7.72% | ||||||
| Highest Quarterly Return, Date | Dec. 31, 2023 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (5.43%) | ||||||
| Lowest Quarterly Return, Date | Sep. 30, 2022 | ||||||
| Janus Henderson Securitized Income ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Securitized Income ETF | Janus Henderson Securitized Income ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 3.92% | ||||||
| Highest Quarterly Return, Date | Sep. 30, 2024 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | 0.25% | ||||||
| Lowest Quarterly Return, Date | Dec. 31, 2024 | ||||||
| Janus Henderson Short Duration Income ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Market Index Changed | Effective on or about October 7, 2025, the Fund changed the performance benchmark from the FTSE 3-Month U.S. Treasury Bill Index to the ICE BofA U.S. 3-Month Treasury Bill Total Return Index as it has investment characteristics similar to the Fund. | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Short Duration Income ETF | Janus Henderson Short Duration Income ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 2.47% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (0.88%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2022 | ||||||
| Janus Henderson Global Artificial Intelligence ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The Fund does not have a full calendar year of operations. When provided, the information is designed to offer some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns compare with a broad measure of market performance. Past performance does not necessarily indicate how the Fund will perform in the future. Performance information for certain periods is included in the Fund’s annual and/or semiannual report and is available at janushenderson.com/info or by calling 1-800-668-0434. |
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| Performance Past Does Not Indicate Future [Text] | Past performance does not necessarily indicate how the Fund will perform in the future. | ||||||
| Performance One Year or Less [Text] | The Fund does not have a full calendar year of operations. | ||||||
| Performance Availability Website Address [Text] | janushenderson.com/info | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434. | ||||||
| Janus Henderson U.S. Real Estate ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses. |
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| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson U.S. Real Estate ETF | Janus Henderson U.S. Real Estate ETF | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 17.21% | ||||||
| Highest Quarterly Return, Date | Sep. 30, 2024 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (15.23%) | ||||||
| Lowest Quarterly Return, Date | Jun. 30, 2022 | ||||||
| Janus Henderson Mid Cap Growth Alpha ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Mid Cap Growth Alpha ETF | Janus Henderson Mid Cap Growth Alpha ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||
| Highest Quarterly Return | 13.34% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2025 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||
| Lowest Quarterly Return | (7.93%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2025 | ||||||
| Janus Henderson Small Cap Growth Alpha ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses. Effective May 12, 2025, the Fund changed its investment strategy. Performance prior to May 12, 2025, reflects the Fund’s former strategy; its performance may have differed if the Fund’s current strategy had been in place.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
|
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
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| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Small Cap Growth Alpha ETF | Janus Henderson Small Cap Growth Alpha ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 34.62% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (26.88%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||
| Janus Henderson Small/Mid Cap Growth Alpha ETF | |||||||
| Prospectus [Line Items] | |||||||
| Bar Chart and Performance Table [Heading] | PERFORMANCE INFORMATION | ||||||
| Performance Narrative [Text Block] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. All figures assume reinvestment of dividends and distributions and include the effect of the Fund’s recurring expenses. Effective May 12, 2025, the Fund changed its investment strategy. Performance prior to May 12, 2025, reflects the Fund’s former strategy; its performance may have differed if the Fund’s current strategy had been in place.
The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. Updated performance information is available at janushenderson.com/performance or by calling 1-800-668-0434. |
||||||
| Performance Past Does Not Indicate Future [Text] | The Fund’s past performance (before and after taxes) does not necessarily indicate how it will perform in the future. | ||||||
| Performance Information Illustrates Variability of Returns [Text] | The following information provides some indication of the risks of investing in the Fund by showing how the Fund’s performance has varied over time. The bar chart depicts the change in performance from year to year during the periods indicated. | ||||||
| Performance Additional Market Index [Text] | The table compares the Fund’s average annual returns for the periods indicated to a broad-based securities market index, as well as to one or more additional indices that have investment characteristics similar to those of the Fund. | ||||||
| Bar Chart [Heading] | Annual Total Returns (calendar year-end) | ||||||
| Bar Chart Closing [Text Block] |
|
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| Performance Table Heading | Average Annual Total Returns (periods ended 12/31/25) | ||||||
| Performance Table Uses Highest Federal Rate | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. | ||||||
| Performance Table Not Relevant to Tax Deferred | The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. | ||||||
| Performance Table Explanation after Tax Higher | If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures. | ||||||
| Performance Table Closing [Text Block] | After-tax returns in the table above are calculated using the historical highest individual U.S. federal marginal income tax rates and do not reflect the impact of state or local taxes. Actual after-tax returns depend on your individual tax situation and may differ from those shown in the preceding table. The after-tax return information shown above does not apply to Fund shares held through a tax-advantaged account, such as a 401(k) plan or an IRA. |
||||||
| Performance Availability Website Address [Text] | janushenderson.com/performance | ||||||
| Performance Availability Phone [Text] | 1-800-668-0434 | ||||||
| Janus Henderson Small/Mid Cap Growth Alpha ETF | Janus Henderson Small/Mid Cap Growth Alpha ETF Shares | |||||||
| Prospectus [Line Items] | |||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter: | ||||||
| Highest Quarterly Return | 34.59% | ||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter: | ||||||
| Lowest Quarterly Return | (25.89%) | ||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 |