| Label | Element | Value | ||
|---|---|---|---|---|
| William Blair Small-Mid Cap Value Fund | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk/Return [Heading] | rr_RiskReturnHeading | WILLIAM BLAIR SMALL-MID CAP VALUE FUND SUMMARY | ||
| Objective [Heading] | rr_ObjectiveHeading | INVESTMENT OBJECTIVE: | ||
| Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The William Blair Small-Mid Cap Value Fund seeks long-term capital appreciation. | ||
| Expense [Heading] | rr_ExpenseHeading | FEES AND EXPENSES: | ||
| Expense Narrative [Text Block] | rr_ExpenseNarrativeTextBlock | This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. | ||
| Shareholder Fees Caption [Text] | rr_ShareholderFeesCaption | Shareholder Fees (fees paid directly from your investment): | ||
| Operating Expenses Caption [Text] | rr_OperatingExpensesCaption | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment): | ||
| Fee Waiver or Reimbursement over Assets, Date of Termination | rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination | April 30, 2025 | ||
| Portfolio Turnover [Heading] | rr_PortfolioTurnoverHeading | Portfolio Turnover: | ||
| Portfolio Turnover [Text Block] | rr_PortfolioTurnoverTextBlock | The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the period August 17, 2023 (commencement of operations) through December 31, 2023, the Fund’s portfolio turnover rate was 33% of the average value of its portfolio. | ||
| Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 33.00% | ||
| Expense Example [Heading] | rr_ExpenseExampleHeading | Example: | ||
| Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | This example is intended to help you compare the cost of investing in shares of the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The example also assumes that your investment has a 5% return each year and the Fund’s operating expenses remain the same. The figures reflect the expense limitation for the first two years. Although your actual costs may be higher or lower, based on these assumptions your costs would be: | ||
| Strategy [Heading] | rr_StrategyHeading | PRINCIPAL INVESTMENT STRATEGIES: | ||
| Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in equity securities of small capitalized (“small cap”) and medium capitalized (“mid cap”) companies. For purposes of the Fund, the Adviser considers a company to be a small cap or mid cap company if it has a market capitalization no larger than the largest capitalized company included in the Russell Midcap® Index at the time of the Fund’s investment. Securities of companies whose market capitalizations no longer meet this definition after purchase may continue to be held in the Fund. To a limited extent, the Fund may also purchase stocks of companies with business characteristics and value prospects similar to small to mid cap companies, but that may have market capitalizations above the market capitalization of the largest member of the Russell Midcap® Index. The Fund may invest in equity securities listed on a national securities exchange or traded in the over-the-counter markets. The Fund invests primarily in common stocks, but it may also invest in other types of equity securities, including real estate investment trusts (“REITs”) and American Depositary Receipts (“ADRs”). The Russell Midcap® Index measures the performance of the 800 companies with the lowest market capitalizations in the Russell 1000® Index. The size of companies in the Russell Midcap® Index may change with market conditions. In addition, changes to the composition of the Russell Midcap® Index can change the market capitalization range of companies included in the index. As of March 31, 2024, , the Russell Midcap® Index included securities issued by companies that ranged in size between $351.9 million and $89 billion. The Russell 2500TM Value Index, the Fund’s performance benchmark, measures the performance of those Russell 2500TM companies with lower price-to-book ratios and lower forecasted growth values. In selecting investments for the Fund, the Adviser typically looks to invest in companies with leading market share positions, shareholder-oriented managements, and strong balance sheet and cash flow ratios. Usually, the shares of the companies the Adviser buys are selling at a price to earnings ratio below the average price to earnings ratio of the stocks that comprise the Russell 2500TM Value Index. In addition, the companies selected by the Adviser usually have higher returns on equity and capital than the average company in the Russell 2500TM Value Index. The Adviser screens the Fund’s universe of potential investments to identify potentially undervalued securities based on factors such as financial strength, earnings valuation and earnings quality. The Adviser further narrows the list of potential investments through traditional fundamental security analysis, which may include interviews with company management and a review of the assessments and opinions of outside analysts and consultants. Securities are sold when the Adviser believes the shares have become relatively overvalued or it finds more attractive alternatives. The Adviser generally will not sell a security merely due to market appreciation outside the Fund’s target capitalization range if it believes the company has valuation upside potential.
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| Risk [Heading] | rr_RiskHeading | PRINCIPAL RISKS: | ||
| Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | FUND PERFORMANCE HISTORY: | ||
| Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | Information on the Fund’s annual total returns and average annual total returns will be provided after the Fund has completed a full calendar year of operations. Updated performance information will be available on the Fund’s website at www.williamblairfunds.com or by calling 1‑800‑635‑2886. | ||
| Performance One Year or Less [Text] | rr_PerformanceOneYearOrLess | Information on the Fund’s annual total returns and average annual total returns will be provided after the Fund has completed a full calendar year of operations. | ||
| Performance Availability Phone [Text] | rr_PerformanceAvailabilityPhone | 1‑800‑635‑2886 | ||
| Performance Availability Website Address [Text] | rr_PerformanceAvailabilityWebSiteAddress | www.williamblairfunds.com | ||
| William Blair Small-Mid Cap Value Fund | Risk Lose Money [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | The Fund’s returns will vary, and you could lose money by investing in the Fund. | ||
| William Blair Small-Mid Cap Value Fund | Equity Funds General Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Equity Funds General Risk. Because the Fund invests substantially all of its assets in equity securities of small cap and mid cap U.S. companies, the primary risk is that the value of the equity securities it holds might decrease in response to the activities of an individual company or in response to general market, business and economic conditions. If this occurs, the Fund’s share price may also decrease. In addition, there is the risk that individual securities may not perform as expected or a strategy used by the Adviser may fail to produce its intended result.
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| William Blair Small-Mid Cap Value Fund | Market Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Market Risk. The value of the Fund’s investments may go up or down, sometimes rapidly or unpredictably. The value of an investment may decline due to factors affecting securities markets generally or particular industries represented in the securities markets. The value of an investment may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, recessions, inflation, rapid interest rate changes, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Events such as war, acts of terrorism, social unrest, natural disasters, the spread of infectious illness or other public health threats could also significantly impact the Fund and its investments. The value of an investment may also decline due to factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Geopolitical and other events may also disrupt securities markets and adversely affect global economies and markets and thereby decrease the value of the Fund’s investments.
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| William Blair Small-Mid Cap Value Fund | Share Ownership Concentration Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Share Ownership Concentration Risk. To the extent that a significant portion of the Fund’s shares is held by a limited number of shareholders or their affiliates, there is a risk that the share trading activities of these shareholders could disrupt the Fund’s investment strategies, which could have adverse consequences for the Fund and other shareholders (e.g., by requiring the Fund to sell investments at inopportune times or causing the Fund to maintain larger-than-expected cash positions pending acquisition of investments).
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| William Blair Small-Mid Cap Value Fund | Style Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Style Risk. Different investment styles (e.g., growth vs. value, quality bias, market capitalization focus) tend to shift in and out of favor depending on market conditions and investor sentiment, and at times when the investment style used by the Adviser for the Fund is out of favor, the Fund may underperform other equity funds that use different investment styles.
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| William Blair Small-Mid Cap Value Fund | Focus Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Focus Risk. To the extent that the Fund focuses its investments in particular industries, asset classes or sectors of the economy, any market changes affecting companies in those industries, asset classes or sectors may impact the Fund’s performance.
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| William Blair Small-Mid Cap Value Fund | Operational and Technology Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Operational and Technology Risk. Cyber-attacks, disruptions, or failures that affect the Fund’s service providers, counterparties, market participants, or issuers of securities held by the Fund may adversely affect the Fund and its shareholders, including by causing losses for the Fund or impairing Fund operations.
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| William Blair Small-Mid Cap Value Fund | Small and Mid Cap Company Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Small and Mid Cap Company Risk. Stocks of small and mid cap companies involve greater risk than those of larger, more established companies. This is because small and mid cap companies may be in earlier stages of development, may be dependent on a small number of products or services, may lack substantial capital reserves and/or do not have proven track records. Small and mid cap companies may be traded in low volumes. This can increase volatility and increase the risk that the Fund will not be able to sell a security on short notice at a reasonable price. The securities of small and mid cap companies may be more volatile and less liquid than securities of large capitalized companies.
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| William Blair Small-Mid Cap Value Fund | REIT Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | REIT Risk. REITs are pooled investment vehicles that own, and usually operate, income-producing real estate. REITs are susceptible to the risks associated with direct ownership of real estate, such as the following: declines in property values; increases in property taxes, operating expenses, interest rates or competition; overbuilding; zoning changes; and losses from casualty or condemnation. REITs typically incur fees that are separate from those of the Fund. Accordingly, the Fund’s shareholders will indirectly bear a proportionate share of the REITs’ operating expenses, in addition to paying Fund expenses. REIT operating expenses are not reflected in the fee table and example in this Prospectus.
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| William Blair Small-Mid Cap Value Fund | Foreign Investment Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | Foreign Investment Risk. The Fund’s investments in ADRs are subject to foreign securities risk. ADRs are certificates evidencing ownership of shares of a foreign issuer that are issued by depositary banks and traded on U.S. exchanges. Although ADRs are alternatives to directly purchasing the underlying foreign securities in their national markets and currencies, they continue to be subject to many of the risks associated with investing directly in foreign securities.
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| William Blair Small-Mid Cap Value Fund | New Fund Risk [Member] | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Risk [Text Block] | rr_RiskTextBlock | New Fund Risk. As a new fund, there can be no assurance that the Fund will grow to or maintain an economically viable size, in which case it could ultimately liquidate.
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| William Blair Small-Mid Cap Value Fund | Class I | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Maximum Sales Charge (Load) Imposed on Purchases | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||
| Redemption Fee | rr_RedemptionFeeOverRedemption | none | ||
| Management Fee | rr_ManagementFeesOverAssets | 0.80% | ||
| Distribution (Rule 12b-1) Fee | rr_DistributionAndService12b1FeesOverAssets | none | ||
| Other Expenses | rr_OtherExpensesOverAssets | 9.89% | ||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 10.69% | ||
| Fee Waiver and/or Expense Reimbursement | rr_FeeWaiverOrReimbursementOverAssets | 9.84% | [1] | |
| Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement | rr_NetExpensesOverAssets | 0.85% | ||
| 1 Year | rr_ExpenseExampleYear01 | $ 87 | ||
| 3 Years | rr_ExpenseExampleYear03 | 2,189 | ||
| 5 Years | rr_ExpenseExampleYear05 | 4,058 | ||
| 10 Years | rr_ExpenseExampleYear10 | $ 7,877 | ||
| William Blair Small-Mid Cap Value Fund | Class R6 | ||||
| Risk/Return: | rr_RiskReturnAbstract | |||
| Maximum Sales Charge (Load) Imposed on Purchases | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||
| Redemption Fee | rr_RedemptionFeeOverRedemption | none | ||
| Management Fee | rr_ManagementFeesOverAssets | 0.80% | ||
| Distribution (Rule 12b-1) Fee | rr_DistributionAndService12b1FeesOverAssets | none | ||
| Other Expenses | rr_OtherExpensesOverAssets | 9.86% | ||
| Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 10.66% | ||
| Fee Waiver and/or Expense Reimbursement | rr_FeeWaiverOrReimbursementOverAssets | 9.86% | [1] | |
| Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement | rr_NetExpensesOverAssets | 0.80% | ||
| 1 Year | rr_ExpenseExampleYear01 | $ 82 | ||
| 3 Years | rr_ExpenseExampleYear03 | 2,179 | ||
| 5 Years | rr_ExpenseExampleYear05 | 4,046 | ||
| 10 Years | rr_ExpenseExampleYear10 | $ 7,864 | ||
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