Expense Example: This Example is intended to help you compare the cost of investing in 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 that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund uses a growth style of investment in equity securities, including common stocks and other equity securities of issuers, and under normal market conditions, invests substantially all (no less than 80%) of its net assets (plus the amount of borrowings for investment purposes) in emerging markets companies. Emerging market companies are (i) companies organized under the laws of an emerging market country or having securities which are traded principally on an exchange or over-the-counter in an emerging market country; or (ii) companies which, regardless of where organized or traded, have a significant amount of assets located in and/or derive a significant amount of their revenues from goods purchased or sold, investments made or services performed in or with emerging market countries. There are no specific limitations on the

percentage of assets that may be invested in securities of issuers located in any one country at a given time; the Fund may invest significant assets in any single emerging market country. The Fund generally defines an “emerging market” as including, but not limited to, any of the countries or markets represented in the MSCI Emerging Markets Index, or any other country or market with similar emerging characteristics. The Fund may invest in companies with limited or no operating histories. The Fund frequently and actively trades its portfolio securities.

Investment decisions for the Fund’s growth style of investing, for those companies with operating histories, are based on the determination that a company’s revenue and earnings growth can materially exceed market expectations and that a company possesses the ability to undergo an incrementally positive change in growth and earnings trajectories. These decisions involve evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. The evaluation of behavioral and macro factors represents significant aspects of the investment adviser’s philosophy and are integrated into the investment adviser’s bottom-up analysis on individual securities. The decision is also informed by the evaluation of technical or market factors, including price and volume trends, relative strength and institutional interest. To a lesser extent, the Fund’s investment adviser also utilizes macroeconomic or country-specific analyses to evaluate the sustainability of a company’s growth rate. The Fund sells holdings for a variety of reasons, including the deterioration of the earnings profile, the violation of specific technical thresholds, to shift into securities with more compelling risk/reward characteristics or to alter sector or country exposure.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for long-term investors who can accept the risks involved in investing in foreign securities. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Market Risk. The Fund is subject to market risk, which is the possibility that stock prices overall will decline over short or long periods. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares. Due to the uncertainty caused by war, acts of terrorism, geopolitical conflict, public health issues, recessions, global pandemics and other risks, global markets may experience increased volatility which could adversely affect the performance of the Fund’s investments.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market.

Foreign Securities and Currencies Risk. The following risks may be associated with investments in foreign securities: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; U.S. and foreign government actions, such as the imposition of tariffs, economic and trade sanctions or embargoes; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, expropriation, devaluation or other adverse political or social developments. To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of a security denominated in that foreign currency, thereby decreasing the Fund’s overall net asset value. Currency rates in foreign countries may fluctuate significantly over short or long periods of time for a number of reasons, including changes in interest rates, imposition of currency controls and economic or political developments in the U.S. or abroad.

Emerging Market Risk. The Fund invests primarily in emerging markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers. To the extent the Fund invests in frontier countries, these risks will be magnified. Frontier countries generally have smaller economies and less developed capital markets than traditional emerging market countries.

Small- and Medium-Sized Company Risk. The Fund invests in companies that are smaller, less established, with limited operating histories and less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the securities of small- and medium-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well-known issuers can be more volatile than that of larger issuers.

Allocation Risk. The Fund’s overall risk level will depend on the companies, countries, regions, markets, market sectors, industries and asset classes in which the Fund is invested. Because the Fund may have significant weightings in a particular company, country, region, asset class, industry, market or market sector, the value of the Fund’s shares may be affected by events that adversely affect that company, country, region, market, industry, asset class, or market sector and may fluctuate more than that of a less focused fund.

The Fund is expected to have significant exposure to China as well as the far east region. Many countries in this region are subject to political risk, including corruption and regional conflict with neighboring countries. In addition, many far east countries are subject to social and labor risks associated with demands for improved political, economic, and social conditions. The far east region, and particularly China and South Korea, may be adversely affected by political, military, economic and other factors related to North Korea. Expropriation, nationalization, confiscatory taxation, political, economic or social instability, environmental issues or other developments could also adversely affect and significantly diminish the value of the Chinese companies in which the Fund invests.

Equity Securities Risk. In a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

Depositary Receipts. The Fund may invest in foreign securities in the form of depositary receipts which include American Depositary Receipts (“ADRs”), European Depository Receipts (“EDRs”) and Global Depository Receipts (“GDRs”) (collectively “Depository Receipts”). Investment in Depository Receipts does not eliminate the risks inherent in investing in the securities of foreign issuers, which include market, political, tax, currency and regulatory risk. To the extent a Fund acquires Depositary Receipts through banks which do not have a contractual relationship with the foreign issuer of the security underlying the Depositary Receipts to issue and service such unsponsored Depositary Receipts, there may be an increased possibility that the Fund would not become aware of and be able to respond to corporate actions such as stock splits or rights offerings involving the foreign issuer in a timely manner. In addition, the lack of information may result in inefficiencies in the valuation of such instruments. In the case of an unsponsored Depository Receipt, the Fund may bear higher expenses and encounter greater difficulty in receiving shareholder communications than it would have with a sponsored Depository Receipt. The market value of Depository Receipts is dependent upon the market value of the underlying securities and fluctuations in the relative value of the currencies in which the Depositary Receipts and the underlying securities are quoted.

Manager Risk. How the Fund’s investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or the investment adviser does not implement the strategy successfully.

High Rates of Turnover. It is anticipated that the Fund will experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes when distributed to shareholders.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility—or variability—of the Fund’s Investor Shares annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of two broad-based securities indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.driehaus.com/performance

Bar Chart [Heading]

rr_BarChartHeading

Annual Returns for the years ended December 31

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns as of December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The table shows returns on a before-tax and after-tax basis. After-tax returns are shown only for Investor Shares and after-tax returns for Institutional Shares will vary from Investor Shares. After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

For periods prior to the inception of the Institutional Shares class on July 17, 2017, the performance shown for the Institutional Shares is based on the historical performance of the Fund’s Investor Shares. Institutional Shares would have substantially similar annual returns because the shares are invested in the same portfolio and would differ only to the extent that the shares do not have the same expenses.

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

9.88%

1 Year

rr_AverageAnnualReturnYear01

(8.41%)

^[1]

10 Years

rr_AverageAnnualReturnYear10

7.52%

^[1]

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)

rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther

none

Exchange Fee

rr_ExchangeFee

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.36%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.30%

^[2]

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

412

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,568

Annual Return 2013

rr_AnnualReturn2013

8.92%

Annual Return 2015

rr_AnnualReturn2015

(10.49%)

Annual Return 2017

rr_AnnualReturn2017

42.52%

Annual Return 2019

rr_AnnualReturn2019

25.34%

Annual Return 2021

rr_AnnualReturn2021

(1.92%)

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(21.15%)

5 Years

rr_AverageAnnualReturnYear05

13.31%

1 Year

rr_AverageAnnualReturnYear01

(5.97%)

10 Years

rr_AverageAnnualReturnYear10

7.21%

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

10.42%

Trading Symbol

dei_TradingSymbol

DIEMX

Maximum Deferred Sales Charge (as a percentage of Offering Price)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

0.93%

Acquired Fund Fees and Expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 110

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

595

1 Year

rr_AverageAnnualReturnYear01

(1.69%)

10 Years

rr_AverageAnnualReturnYear10

8.14%

Prospectus [Line Items]

rr_ProspectusLineItems

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

April 30, 2023

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 rate 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 most recent fiscal year, the Fund’s portfolio turnover rate was 178% of the average value of its portfolio.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example: This Example is intended to help you compare the cost of investing in 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 that the Fund’s operating expenses remain the same. The Expense Reimbursement shown in the Annual Fund Operating Expenses table is reflected for the first year in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund uses a growth style of investment in equity securities, including common stocks and other equity securities of issuers. Under normal market conditions, the Fund invests substantially all (no less than 80%) of its net assets (plus the amount of borrowings for investment purposes) in small capitalization emerging markets companies. For purposes of the Fund, the investment adviser considers a company to be a small capitalization company if it is within the same market capitalization range at the time of investment as those included in the MSCI Emerging Markets Small Cap Index. For the avoidance of doubt, while the reference index is “float-adjusted,” meaning it excludes closely held and other shares unavailable to investors, the investment adviser does not consider a float-adjustment when determining the market capitalization of a company. As of March 31, 2022, 98% of the MSCI Emerging Markets Small Cap Index consisted of companies with a market capitalization of less than $6 billion.

Emerging markets companies are (i) companies organized under the laws of an emerging market country or having securities which are traded principally on an exchange or over-the-counter in an emerging market country; or (ii) companies which, regardless of where organized or traded, have a significant amount of assets located in and/or derive a significant amount of their revenues from goods purchased or sold, investments made or services performed in or with emerging market countries. The Fund generally defines an “emerging market” as including, but not limited to, any of the countries or markets represented in the MSCI Emerging Markets Index, or any other country or market with similar emerging characteristics. There are also no specific limitations on the percentage of assets that may be invested in securities of issuers located in any one country at a given time; the Fund may invest significant assets in any single emerging market country. The Fund may invest in companies with limited or no operating histories. The Fund frequently and actively trades its portfolio securities.

Investment decisions for the Fund’s growth style of investing, for those companies with operating histories, are based on the determination that a company’s revenue and earnings growth can materially exceed market expectations and that a company possesses the ability to undergo an incrementally positive change in growth and earnings trajectories. These decisions involve evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. The evaluation of behavioral and macro factors represents significant aspects of the investment adviser’s philosophy and are integrated into the investment adviser’s bottom-up analysis on individual securities. The decision is also informed by the evaluation of technical or market factors, including price and volume trends, relative strength and institutional interest. To a lesser extent, the Fund’s investment adviser also utilizes macroeconomic or country-specific analyses to evaluate the sustainability of a company’s growth rate. The Fund sells holdings for a variety of reasons, including the deterioration of the earnings profile, the violation of specific technical thresholds, to shift into securities with more compelling risk/reward characteristics or to alter sector or country exposure.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for long-term investors who can accept the risks involved in investing in foreign securities. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Market Risk. The Fund is subject to market risk, which is the possibility that stock prices overall will decline over short or long periods. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares. Due to the uncertainty caused by war, acts of terrorism, geopolitical conflict, public health issues, recessions, global pandemics and other risks, global markets may experience increased volatility which could adversely affect the performance of the Fund’s investments.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market.

Foreign Securities and Currencies Risk. The following risks may be associated with investments in foreign securities: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; U.S. and foreign government actions, such as the imposition of tariffs, economic and trade sanctions or embargoes; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, illiquidity, expropriation, devaluation or other adverse political or social developments. To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of

a security denominated in that foreign currency, thereby decreasing the Fund’s overall net asset value. Currency rates in foreign countries may fluctuate significantly over short or long periods of time for a number of reasons, including changes in interest rates, imposition of currency controls and economic or political developments in the U.S. or abroad.

Emerging Market Risk. The Fund invests primarily in emerging markets and therefore, the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers. To the extent the Fund invests in frontier countries, these risks will be magnified. Frontier countries generally have smaller economies and less developed capital markets than traditional emerging market countries.

Small- and Medium-Sized Company Risk. The Fund invests in companies that are smaller, less established, with limited operating histories and less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the securities of small- and medium-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well-known issuers can be more volatile than that of larger issuers.

Allocation Risk. The Fund’s overall risk level will depend on the companies, countries, regions, markets, market sectors, industries and asset classes in which the Fund is invested. Because the Fund may have significant weightings in a particular company, country, region, asset class, industry, market or market sector, the value of the Fund’s shares may be affected by events that adversely affect that company, country, region, market, industry, asset class, or market sector and may fluctuate more than that of a less focused fund.

The Fund is expected to have significant exposure to the far east region. Many countries in this region are subject to political risk, including corruption and regional conflict with neighboring countries. In addition, many countries in this region are subject to social and labor risks associated with demands for improved political, economic, and social conditions. The far east region, and particularly China and South Korea, may be adversely affected by political, military, economic, and other factors related to North Korea.

Equity Securities Risk. In a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

Depositary Receipts. The Fund may invest in foreign securities in the form of depositary receipts which include American Depositary Receipts (“ADRs”), European Depository Receipts (“EDRs”) and Global Depository Receipts (“GDRs”) (collectively “Depository Receipts”). Investment in Depository Receipts does not eliminate the risks inherent in investing in the securities of foreign issuers, which include market, political, tax, currency and regulatory risk. To the extent a Fund acquires Depositary Receipts through banks which do not have a contractual relationship with the foreign issuer of the security underlying the Depositary Receipts to issue and service such unsponsored Depositary Receipts, there may be an increased possibility that the Fund would not become aware of and be able to respond to corporate actions such as stock splits or rights offerings involving the foreign issuer in a timely manner. In addition, the lack of information may result in inefficiencies in the valuation of such instruments. In the case of an unsponsored Depository Receipt, the Fund may bear higher expenses and encounter greater difficulty in receiving shareholder communications than it would have with a sponsored Depository Receipt. The market value of Depository Receipts is dependent upon the market value of the underlying securities and fluctuations in the relative value of the currencies in which the Depositary Receipts and the underlying securities are quoted.

Manager Risk. How the Fund’s investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or the investment adviser does not implement the strategy successfully.

High Rates of Turnover. It is anticipated that the Fund will experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes when distributed to shareholders.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility—or variability—of the Fund’s annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of two broad-based securities indices.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.driehaus.com/performance

Bar Chart [Heading]

rr_BarChartHeading

Annual Returns for the years ended December 31

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns as of December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

1 Year

rr_AverageAnnualReturnYear01

18.75%

10 Years

rr_AverageAnnualReturnYear10

7.42%

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

12.22%

^[3]

Trading Symbol

dei_TradingSymbol

DRESX

Maximum Deferred Sales Charge (as a percentage of Offering Price)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.10%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.37%

Net Expenses (as a percentage of Assets)

rr_NetExpensesOverAssets

1.24%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

421

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 1,635

Annual Return 2013

rr_AnnualReturn2013

12.11%

Annual Return 2015

rr_AnnualReturn2015

(10.22%)

Annual Return 2017

rr_AnnualReturn2017

33.30%

Annual Return 2019

rr_AnnualReturn2019

33.71%

Annual Return 2021

rr_AnnualReturn2021

15.93%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2020

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(22.32%)

5 Years

rr_AverageAnnualReturnYear05

15.97%

1 Year

rr_AverageAnnualReturnYear01

15.92%

10 Years

rr_AverageAnnualReturnYear10

9.89%

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

12.90%

Risk/Return [Heading]

rr_RiskReturnHeading

Driehaus Emerging Markets Opportunities Fund Ticker: DMAGX

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Driehaus Emerging Markets Opportunities Fund (the “Fund”) seeks to maximize total return. Total return is the sum of capital appreciation and income.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold 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.

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

101.00%

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example: This Example is intended to help you compare the cost of investing in 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 that the Fund’s operating expenses remain the same. The expense reimbursement shown in the Annual Fund Operating Expenses table is reflected for the first year in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund is actively managed by the Fund’s investment adviser. Under normal market conditions, the Fund invests substantially all (no less than 80%) of its net assets (plus the amount of borrowings for investment purposes) in emerging markets securities. Issuers of emerging markets securities may include: (i) issuers organized under the laws of an emerging market country or having securities which are traded principally on an exchange or over-the-counter in an emerging market country; or (ii) issuers which, regardless of where organized or where securities traded, have significant economic exposure in or with emerging market countries. The Fund generally defines an “emerging market” as including, but not limited to, any of the countries or markets represented in the MSCI Emerging Markets Index, or any other country or market with similar emerging characteristics.

The Fund opportunistically invests across multiple asset classes and various security types including equity securities, American Depository Receipts (“ADRs”), Global Depository Receipts (“GDRs”), exchange-traded funds (”ETFs”), currencies, debt securities such as corporate and sovereign/government bonds, equity-convertible securities such as warrants, rights, and options, and derivative securities such as futures contracts, forwards, options and swaps. The Fund may take both long and short positions across these asset classes.

In managing the Fund, the investment adviser uses an investment approach that integrates top-down (focusing on the economy and market trends) analysis of the overall economy and bottom-up (focusing on individual stocks) analysis of individual securities. From a top-down perspective, the investment adviser looks at the relative value of securities across asset classes to identify assets to include in the Fund’s portfolio. Bottom-up analysis employs a growth style of investing based on the determination that, for those companies with operating histories, a company’s revenue and earnings growth can materially exceed market expectations. Bottom-up analysis involves evaluating fundamental factors, including the company’s business model, the competitive landscape, upcoming product introductions and recent and projected financial metrics. The investment adviser’s decision to buy or sell a security is also based on the evaluation of technical or market factors, including price and volume trends, relative strength and institutional interest.

The Fund is not constrained based on the country, region, market capitalization, credit quality or duration of its investments, and its assets may at times be concentrated in a particular country or region. There are no specific limitations on the percentage of assets that may be invested in securities of issuers located in any one market or country at a given time; the Fund may invest significant assets in any single market or country. The composition and asset allocation of the Fund’s investment portfolio will vary over time. For example, during certain times, the Fund’s investment portfolio may be heavily weighted in equity securities, while during other times, the Fund’s investment portfolio may be heavily weighted in debt securities. There are no limitations on the magnitude of such weightings. The securities and instruments in which the Fund invests may also be concentrated in a particular country, asset class, segment of the economy, or issuer. The Fund may invest in issuers across all market capitalizations as well as in issuers with limited or no operating histories. The Fund may invest in debt securities with a range of maturities from short to long term. Debt securities may include below investment grade debt securities (“junk bonds”) which are regarded as speculative with respect to the issuer’s capacity to pay interest and to repay principal.

The Fund’s investments in derivatives provide long and short exposures to equity securities, ETFs, debt securities, commodities, currencies and interest rate movements. Derivatives may provide more efficient and economical exposure to market segments than direct investments and may also be a quicker and more efficient way to alter the Fund’s exposure than buying and selling direct investments. The Fund may purchase or write options on equity securities, ETFs and other similar securities, as well as on futures and foreign currencies. The Fund may also engage in short sale transactions. In seeking to achieve its investment objective, the Fund may invest in deliverable and non-deliverable foreign currency forwards, credit default swaps, and interest rate swaps. Derivatives may be used for hedging purposes, including to hedge against interest rate, credit and currency fluctuations, as well as for speculative purposes to achieve the Fund’s investment objective.

In addition to the Fund’s currency exposure that results from its investments in equity and debt securities denominated in foreign currencies (and any related hedging), the Fund may hold foreign currency (or related derivatives) independently of any such investments, may hold a currency even if the Fund does not hold any securities denominated in that currency, and may have long or short exposure to a currency.

The Fund may hold a substantial position in cash and money market instruments. The cash holdings of the Fund will vary significantly based on the investment adviser’s use of derivatives. Generally, as the Fund holds more derivatives, the Fund will be required to post more cash margin, resulting in a higher cash balance, which may be significant.

Risk Narrative [Text Block]

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All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for investors who seek to maximize total return. Of course, there can be no assurance that the Fund will achieve its objective. As with any investment, you may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Market Risk. The Fund is subject to market risk, which is the possibility that the value of the Fund’s assets will fluctuate as the stock, bond or currency markets fluctuate. The value of the Fund’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other events that affect large portions of the market. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares. Due to the uncertainty caused by war, acts of terrorism, geopolitical conflict, public health issues, recessions, global pandemics and other risks, global markets may experience increased volatility which could adversely affect the performance of the Fund’s investments.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market.

Foreign Securities and Currencies Risk. The following risks may be associated with investments in foreign securities: less liquidity; greater volatility; political instability; restrictions on foreign investment and repatriation of capital; less complete and reliable information about foreign companies; reduced government supervision of some foreign securities markets; U.S. and foreign government actions, such as imposition of tariffs, economic and trade sanctions or embargoes; lower responsiveness of foreign management to shareholder concerns; economic issues or developments in foreign countries; fluctuation in exchange rates of foreign currencies and risks of devaluation; imposition of foreign withholding and other taxes; dependence of emerging market companies upon commodities which may be subject to economic cycles; and emerging market risk such as limited trading volume, illiquidity, expropriation, devaluation or other adverse political or social developments. To the extent portfolio securities are issued by foreign issuers or denominated in foreign currencies, the Fund’s investment performance is affected by the strength or weakness of the U.S. dollar against these currencies. Generally, an increase in the value of the U.S. dollar against a foreign currency will reduce the value of a security denominated in that foreign currency, thereby decreasing the Fund’s overall net asset value. Currency rates in foreign countries may fluctuate significantly over short or long periods of time for a number of reasons, including changes in interest rates, imposition of currency controls and economic or political developments in the U.S. or abroad.

Emerging Market Risk. The Fund invests in and is otherwise exposed to emerging markets and therefore the risks described above for foreign securities are typically increased. Investments in securities of issuers located in such countries are speculative and subject to certain special risks. The small size, limited trading volume and relative inexperience of the securities markets in these countries may make the Fund’s investments in such countries illiquid and more volatile than investments in more developed countries, and the Fund may be required to establish special custodial or other arrangements before making investments in these countries. There may be little financial or accounting information available with respect to issuers located in these countries, and it may be difficult as a result to assess the value or prospects of an investment in such issuers. To the extent the Fund invests in frontier countries, these risks will be magnified. Frontier countries generally have smaller economies and less developed capital markets than traditional emerging market countries.

Risks of Derivatives. Derivative instruments (such as swaps, options, futures and forwards) often have risks similar to their underlying currency, security or index, in addition to other risks. The use of derivatives also involves risks different from, and possibly greater than, the risks associated with investing directly in the underlying assets. Derivatives can be highly volatile, illiquid and difficult to value, and there is a risk of imperfect correlation between the value of the derivative and the underlying instrument. Derivative instruments may give rise to leverage and losses on derivatives may substantially exceed the initial investment. When used for hedging, the change in value of the derivative may also not correlate specifically with the currency, security or other risk being hedged. Further, since the Fund may invest in derivatives for speculative purposes, losses from speculative positions in a derivative may be much greater than the derivative’s original cost and may be substantial. With over-the-counter derivatives, there is the risk that the other party to the transaction could default. Derivatives may be subject to pricing or “basis” risk, which exists when a particular derivative becomes extraordinarily expensive relative to historical prices or the prices of its corresponding instrument. Additionally, to the extent the Fund is required to segregate or “set aside” (often referred to as “asset segregation”) liquid assets or otherwise cover open positions with respect to certain derivative instruments, the Fund may be required to sell portfolio instruments to meet these asset segregation requirements. There is a possibility that segregation involving a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

Sovereign Debt Obligation Risk. No established market may exist for many sovereign debt obligations. Reduced secondary market liquidity may have an adverse effect on the market price and the Fund’s ability to dispose of particular instruments when necessary to meet its liquidity requirements or in response to specific economic events such as a deterioration in the creditworthiness of the issuer. Reduced secondary market liquidity for certain sovereign debt obligations may also make it more difficult for the Fund to obtain accurate market quotations for the purpose of valuing its portfolio. Market quotations are generally available on many sovereign debt obligations only from a limited number of dealers and may not necessarily represent firm bids of those dealers or prices for actual sales.

By investing in sovereign debt obligations, the Fund will be exposed to the direct or indirect consequences of political, social, and economic changes in various countries. Political changes in a country may affect the willingness of a foreign government to make or provide for timely payments of its obligations. The country’s economic status, as reflected in, among other things, its inflation rate, the amount of external debt and its gross domestic product, will also affect the government’s ability to honor its obligations.

Risks of Debt Securities. Debt securities may be subject to credit risk, interest rate risk, prepayment and extension risk as well as call risk. Credit risk is the failure of an issuer or borrower to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a bond or creditworthiness of a borrower, which can cause the security’s price to fall, potentially lowering the Fund’s share price. Credit spread risk is the risk that economic and market conditions or any actual or perceived credit deterioration may lead to an increase in the credit spreads (i.e., the difference in yield between two securities of similar maturity but different credit quality) and a decline in price of the issuer’s securities. Prices of bonds tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond prices and, accordingly, the Fund’s share price. The longer a debt security’s effective maturity and duration, the more its price is likely to react to interest rates.

Interest rate changes normally have different effects on variable or floating rate securities than they do on securities with fixed interest rates. When interest rates fall, debt securities may be repaid more quickly than expected and the Fund may be required to reinvest the proceeds at a lower interest rate. This is referred to as “prepayment risk”. When interest rates rise, debt securities may be repaid more slowly than expected and the value of the Fund’s holdings may fall sharply. This is referred to as “extension risk.” If an issuer “calls” its bond before its maturity date during a time of declining interest rates, the Fund might have to reinvest the proceeds in an investment offering a lower yield.

Allocation Risk. The Fund’s overall risk level will depend on the companies, countries, regions, markets, market sectors, industries and asset classes in which the Fund is invested. Because the Fund may have significant weightings in a particular company, country, region, asset class, industry, market or market sector, the value of the Fund’s shares may be affected by events that adversely affect that company, country, region, market, industry, asset class, or market sector and may fluctuate more than that of a less focused fund.

The Fund is expected to have significant exposure to the far east region. Many countries in this region are subject to political risk, including corruption and regional conflict with neighboring countries. In addition, many far east countries are subject to social and labor risks associated with demands for improved political, economic, and social conditions. The far east region, and particularly China and South Korea, may be adversely affected by political, military, economic, and other factors related to North Korea.

High Rates of Turnover. It is anticipated that the Fund will experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes when distributed. To the extent the Fund engages in short sales (which are not included in calculating the portfolio turnover rate), the transaction costs incurred by the Fund are likely to be greater than the transaction costs incurred by a mutual fund that does not take short positions and has a similar portfolio turnover rate.

Liquidity Risk. When there is little or no active trading market for specific types of securities or an unusually high volume of redemptions or other similar conditions it can become more difficult to sell the securities at or near their perceived value or the Fund may sell certain investments at a price or time that is not advantageous in order to meet redemption requests or other cash needs. In such a market, the value of such securities and the Fund’s share price may decrease and in extreme conditions, the Fund could have difficulty meeting redemption requests. No active trading market may exist for some derivatives, bonds or equity securities. Certain securities may be subject to restrictions on resale. The inability to dispose of (or convert to cash) derivatives, bonds, ETFs or equity securities in a timely fashion could result in losses to the Fund.

Risks of Holding Cash or Similar Instruments. During periods when the Fund holds a substantial position in cash and money market instruments, the Fund will earn less income than it would if it invested in higher yielding securities. Holding a large cash position for an extended period of time may result in the Fund not achieving its investment objective. To the extent that

the Fund invests in money market mutual funds for its cash position, the Fund will indirectly bear its pro rata portion of such funds’ management fees and operational expenses. These expenses are in addition to the expenses the Fund bears directly in connection with its own operations.

Manager Risk. How the investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or the investment adviser does not implement the strategy successfully.

Equity Securities Risk. In a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

Small- and Medium-Sized Company Risk. The Fund invests in companies that are smaller, less established, with limited operating histories and less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in many instances the securities of small- and medium-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well-known issuers can be more volatile than that of larger issuers.

Depositary Receipts Risk. The Fund may invest in foreign securities in the form of depositary receipts which include American Depositary Receipts (“ADRs”), European Depository Receipts (“EDRs”) and Global Depository Receipts (“GDRs”) (collectively “Depository Receipts”). Investment in Depository Receipts does not eliminate the risks inherent in investing in the securities of foreign issuers, which include market, political, tax, currency and regulatory risk. To the extent a Fund acquires Depositary Receipts through banks which do not have a contractual relationship with the foreign issuer of the security underlying the Depositary Receipts to issue and service such unsponsored Depositary Receipts, there may be an increased possibility that the Fund would not become aware of and be able to respond to corporate actions such as stock splits or rights offerings involving the foreign issuer in a timely manner. In addition, the lack of information may result in inefficiencies in the valuation of such instruments. In the case of an unsponsored Depository Receipt, the Fund may bear higher expenses and encounter greater difficulty in receiving shareholder communications than it would have with a sponsored Depository Receipt. The market value of Depository Receipts is dependent upon the market value of the underlying securities and fluctuations in the relative value of the currencies in which the Depositary Receipts and the underlying securities are quoted.

Bar Chart and Performance Table [Heading]

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Performance

Performance Information Illustrates Variability of Returns [Text]

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The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart will show the volatility — or variability — of the Fund’s annual total returns over time. The table shows the Fund’s average annual total returns for certain time periods compared to the return of two broad-based market indices.

Performance Availability Website Address [Text]

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www.driehaus.com/performance

Bar Chart [Heading]

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Annual Returns for the years ended December 31

Performance Table Heading

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Average Annual Total Returns as of December 31, 2021

Performance Table Not Relevant to Tax Deferred

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After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

1 Year

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(2.54%)

Inception Date

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Apr. 10, 2017

Prospectus [Line Items]

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Since Inception

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4.95%

^[5]

Trading Symbol

dei_TradingSymbol

DMAGX

Maximum Deferred Sales Charge (as a percentage of Offering Price)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Redemption Fee (as a percentage of Amount Redeemed)

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(2.00%)

Management Fees (as a percentage of Assets)

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0.90%

Acquired Fund Fees and Expenses

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0.01%

Fee Waiver or Reimbursement

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(0.32%)

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Expense Example, with Redemption, 1 Year

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$ 102

Expense Example, with Redemption, 5 Years

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693

Annual Return 2018

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(13.22%)

Annual Return 2020

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30.09%

Highest Quarterly Return, Label

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highest return

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

23.93%

Lowest Quarterly Return, Date

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Mar. 31, 2020

1 Year

rr_AverageAnnualReturnYear01

(0.60%)

Inception Date

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Apr. 10, 2017

Prospectus [Line Items]

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Since Inception

rr_AverageAnnualReturnSinceInception

10.14%

1 Year

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0.30%

Inception Date

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Apr. 10, 2017

Prospectus [Line Items]

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Objective [Heading]

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Investment Objective

Expense [Heading]

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Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover, Rate

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93.00%

Strategy [Heading]

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Principal Investment Strategy

Risk [Heading]

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Principal Risks

Risk Lose Money [Text]

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You may lose money by investing in the Fund.

Performance Narrative [Text Block]

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The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility—or variability—of the Fund’s annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance. Updated performance information is available by visiting www.driehaus.com/performance or by calling 1-800-560-6111.

Performance Availability Phone [Text]

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1-800-560-6111

Performance Past Does Not Indicate Future [Text]

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Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance.

Bar Chart Closing [Text Block]

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During the periods shown in the bar chart, the highest return for a quarter was 27.52% (quarter ended 6/30/20) and the lowest return for a quarter was -25.38% (quarter ended 3/31/20).

Performance Table Uses Highest Federal Rate

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After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes.

Performance Table Closing [Text Block]

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The table shows returns on a before-tax and after-tax basis. After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

Prospectus [Line Items]

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5 Years

rr_AverageAnnualReturnYear05

13.43%

Trading Symbol

dei_TradingSymbol

DRIOX

Maximum Deferred Sales Charge (as a percentage of Offering Price)

rr_MaximumDeferredSalesChargeOverOfferingPrice

none

Redemption Fee (as a percentage of Amount Redeemed)

rr_RedemptionFeeOverRedemption

(2.00%)

Management Fees (as a percentage of Assets)

rr_ManagementFeesOverAssets

1.00%

Expenses (as a percentage of Assets)

rr_ExpensesOverAssets

1.15%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

365

Expense Example, with Redemption, 10 Years

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$ 1,398

Annual Return 2013

rr_AnnualReturn2013

29.24%

Annual Return 2015

rr_AnnualReturn2015

12.58%

Annual Return 2017

rr_AnnualReturn2017

41.44%

Annual Return 2019

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30.41%

Annual Return 2021

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12.49%

Highest Quarterly Return, Date

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Jun. 30, 2020

Lowest Quarterly Return, Label

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lowest return

Lowest Quarterly Return

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(25.38%)

5 Years

rr_AverageAnnualReturnYear05

17.46%

1 Year

rr_AverageAnnualReturnYear01

4.83%

10 Years

rr_AverageAnnualReturnYear10

9.74%

Prospectus [Line Items]

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5 Years

rr_AverageAnnualReturnYear05

12.82%

Risk/Return [Heading]

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Driehaus Micro Cap Growth Fund Ticker: DMCRX

Objective, Primary [Text Block]

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Driehaus Micro Cap Growth Fund seeks to maximize capital appreciation.

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold 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.

Operating Expenses Caption [Text]

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Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

Portfolio Turnover [Text Block]

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The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate 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 most recent fiscal year, the Fund’s portfolio turnover rate was 109% of the average value of its portfolio.

Expense Example Narrative [Text Block]

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Expense Example: This Example is intended to help you compare the cost of investing in 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 that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy Narrative [Text Block]

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The Fund uses a growth style of investment in equity securities, including common stocks and other equity securities of issuers. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in the equity securities of U.S. micro-capitalization (“micro-cap”) companies. For purposes of the Fund, the investment adviser considers a company to be a micro-cap company if it is within the same market capitalization range at the time of investment as those included in the Russell Microcap^® Growth Index. For the avoidance of doubt, while the reference index is “float-adjusted,” meaning it excludes closely held and other shares unavailable to investors, the investment adviser does not consider a float-adjustment when determining the market capitalization of a company. As of March 31, 2022, approximately 99% of the Russell Microcap^® Growth Index consisted of companies with a market capitalization of less than $3.5 billion. Securities of companies whose market capitalization no longer meets this definition after purchase may continue to be held by the Fund. In addition, while the Fund will invest primarily in the equity securities of U.S. micro-cap companies, the Fund may also from time to time invest up to a maximum of 20% of its assets in the equity securities of non-U.S. companies that trade in the U.S. or in securities of companies above the capitalization range of the Russell Microcap^® Growth Index. The Fund may invest in companies with limited or no operating histories. The Fund frequently and actively trades its portfolio securities.

Investment decisions for the Fund’s growth style of investing are based on the belief that fundamentally strong companies are more likely to generate superior earnings growth on a sustained basis and are more likely to experience positive earnings revisions. These decisions involve evaluating a company’s competitive position, evaluating industry dynamics, identifying potential growth catalysts and assessing the financial position of the company. The decision is also informed by the evaluation of relative valuation, macroeconomic and behavioral factors affecting the company and its stock price. The Fund sells holdings for a variety of reasons, including to take profits, changes to the fundamental investment thesis, changes in the risk/reward assessment of the holding, an assessment that the holding is efficiently priced, to make room for more attractive ideas or for other portfolio or risk management considerations.

Risk Narrative [Text Block]

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All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for long-term investors who can accept the risks involved in equity investing. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Market Risk. The Fund is subject to market risk, which is the possibility that stock prices overall will decline over short or long periods. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares. Due to the uncertainty caused by war, acts of terrorism, geopolitical conflict, public health issues, recessions, global pandemics and other risks, global markets may experience increased volatility which could adversely affect the performance of the Fund’s investments.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market.

Small- and Medium-Sized Company Risk. The Funds invest in companies that are smaller, less established, with limited operating histories and less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, in some instances the securities of small- and medium-sized companies are traded only over-the-counter or on a regional securities exchange, and the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well-known issuers can be more volatile than that of larger issuers.

Micro-Cap Company Risk. The securities of micro-cap companies may be more volatile in price, have wider spreads between their bid and ask prices, and have significantly lower trading volumes than the securities of larger capitalization companies. As a result, the purchase or sale of more than a limited number of shares of the securities of a smaller company may affect its market price. The Fund may need a considerable amount of time to purchase or sell its positions in these securities. Some U.S. micro-cap companies are followed by few, if any, securities analysts, and there tends to be less publicly available information about such companies. Their securities generally have even more limited trading volumes and are subject to even more abrupt or erratic market price movements than are small-cap and mid-cap securities, and the Fund may be able to deal with only a few market-makers when purchasing and selling micro-cap securities. Such companies also may have limited markets, financial resources or product lines, may lack management depth, and may be more vulnerable to adverse business or market developments. These conditions, which create greater opportunities to find securities trading well below the investment adviser’s estimate of the company’s current worth, also involve increased risk.

Allocation Risk. The Fund’s overall risk level will depend on the companies, countries, regions, markets, market sectors, industries and asset classes in which the Fund is invested. Because the Fund may have significant weightings in a particular company, country, region, asset class, industry, market or market sector, the value of the Fund’s shares may be affected by events that adversely affect that company, country, region, market, industry, asset class, or market sector and may fluctuate more than that of a less focused fund. The Fund is expected to have significant exposure to the healthcare sector. Health care companies may be negatively impacted by scientific or technological developments, research and development costs, increased competition, rapid product obsolescence and patent expirations. The Fund is also expected to have significant exposure to the information technology sector. Technology companies may be subject to abrupt market movements, short product cycles, changing consumer preferences, aggressive pricing of products and services, a limited qualified workforce, new market entrants and intellectual property disputes.

Equity Securities Risk. In a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

High Rates of Turnover. It is anticipated that the Fund will experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes when distributed to shareholders.

Manager Risk. How the Fund’s investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or the investment adviser does not implement the strategy successfully.

Bar Chart and Performance Table [Heading]

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Performance

Performance Information Illustrates Variability of Returns [Text]

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The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility — or variability — of the Fund’s annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index.

Performance Availability Website Address [Text]

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www.driehaus.com/performance

Bar Chart [Heading]

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Annual Returns for the years ended December 31

Performance Table Heading

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Average Annual Total Returns as of December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

1 Year

rr_AverageAnnualReturnYear01

0.88%

10 Years

rr_AverageAnnualReturnYear10

12.65%

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)

rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther

none

Exchange Fee

rr_ExchangeFee

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.13%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 140

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

755

Annual Return 2012

rr_AnnualReturn2012

20.17%

Annual Return 2014

rr_AnnualReturn2014

8.21%

Annual Return 2016

rr_AnnualReturn2016

17.78%

Annual Return 2018

rr_AnnualReturn2018

3.88%

Annual Return 2020

rr_AnnualReturn2020

85.60%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

54.83%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Mar. 31, 2020

1 Year

rr_AverageAnnualReturnYear01

24.73%

10 Years

rr_AverageAnnualReturnYear10

25.66%

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

24.55%

1 Year

rr_AverageAnnualReturnYear01

17.68%

10 Years

rr_AverageAnnualReturnYear10

20.28%

Prospectus [Line Items]

rr_ProspectusLineItems

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

149.00%

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Lose Money [Text]

rr_RiskLoseMoney

You may lose money by investing in the Fund.

Performance Narrative [Text Block]

rr_PerformanceNarrativeTextBlock

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility—or variability—of the Fund’s Investor Shares annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index. Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance. Updated performance information is available by visiting www.driehaus.com/performance or by calling 1-800-560-6111.

The Fund’s performance shown includes the performance of Driehaus Institutional Small Cap, L.P. (the “Predecessor Partnership”), the Fund’s predecessor, for the periods before the Fund’s registration statement became effective. The Fund succeeded to the assets of the Predecessor Partnership, Driehaus Small Cap Investors, L.P., Driehaus Institutional Small Cap Recovery Fund, L.P. and Driehaus Small Cap Recovery Fund, L.P., (together, the “Limited Partnerships”), which were managed by the same investment team with substantially the same investment objective, policies and philosophies as the Fund. The investment portfolios of the Limited Partnerships were identical and therefore had similar performance. The performance of the Predecessor Partnership is shown here because it has been in operation the longest. The Fund succeeded to the Limited Partnerships’ assets on August 21, 2017. The Predecessor Partnership was not registered under the Investment Company Act of 1940, as amended (“1940 Act”), and thus was not subject to certain investment and operational restrictions that are imposed by the 1940 Act. If the Predecessor Partnership had been registered under the 1940 Act, its performance may have been adversely affected. The Predecessor Partnership’s performance has not been restated to reflect estimated expenses applicable to each class of shares of the Fund. Accordingly, future Fund performance may be different than the Predecessor Partnership’s past performance. After-tax performance returns are not included for the Predecessor Partnership.

The Predecessor Partnership was not a regulated investment company under Subchapter M of the Internal Revenue Code of 1986, as amended, and therefore did not distribute current or accumulated earnings and profits and was not subject to the diversification and source of income requirements applicable to regulated investment companies.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

1-800-560-6111

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

Of course, the Fund’s past performance (before and after taxes) is not necessarily an indication of its future performance.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

During the periods shown in the bar chart, the highest return for a quarter was 43.51% (quarter ended 6/30/20) and the lowest return for a quarter was -23.62% (quarter ended 12/31/18).

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes.

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

After-tax returns are shown only for Investor Shares and after-tax returns for Institutional Shares will vary from Investor Shares.

1 Year

rr_AverageAnnualReturnYear01

2.83%

10 Years

rr_AverageAnnualReturnYear10

14.14%

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)

rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther

none

Exchange Fee

rr_ExchangeFee

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.39%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 101

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

547

Annual Return 2012

rr_AnnualReturn2012

10.15%

Annual Return 2014

rr_AnnualReturn2014

2.93%

Annual Return 2016

rr_AnnualReturn2016

10.72%

Annual Return 2018

rr_AnnualReturn2018

3.33%

Annual Return 2020

rr_AnnualReturn2020

63.77%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

highest return

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

43.51%

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

1 Year

rr_AverageAnnualReturnYear01

21.12%

10 Years

rr_AverageAnnualReturnYear10

22.34%

Prospectus [Line Items]

rr_ProspectusLineItems

5 Years

rr_AverageAnnualReturnYear05

27.56%

1 Year

rr_AverageAnnualReturnYear01

14.02%

10 Years

rr_AverageAnnualReturnYear10

18.64%

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)

rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther

none

Exchange Fee

rr_ExchangeFee

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.13%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 75

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

406

1 Year

rr_AverageAnnualReturnYear01

21.44%

10 Years

rr_AverageAnnualReturnYear10

22.49%

Prospectus [Line Items]

rr_ProspectusLineItems

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

May 1, 2023

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 rate 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 most recent fiscal year, the Fund’s portfolio turnover rate was 191% of the average value of its portfolio.

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Expense Example: This Example is intended to help you compare the cost of investing in 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 that the Fund’s operating expenses remain the same. The expense reimbursement shown in the Annual Fund Operating Expenses table is reflected for the first year in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund uses a growth style of investment in equity securities, including common stocks and other equity securities of issuers. Under normal market conditions, the Fund invests at least 80% of its net assets (plus the amount of borrowings for investment purposes) in the equity securities of U.S. small-capitalized (“small-cap”) and U.S. medium-capitalized (“mid-cap”) companies (together, “Small/Mid cap” companies). For purposes of the Fund, the investment adviser considers a company to

be a Small/Mid cap company if it is within the same market capitalization range at the time of investment as those included in the Russell 2500^® Growth Index. For the avoidance of doubt, while the reference index is “float-adjusted,” meaning it excludes closely held and other shares unavailable to investors, the investment adviser does not consider a float-adjustment when determining the market capitalization of a company. As of March 31, 2022, approximately 93% of the Russell 2500^® Growth Index consisted of companies with a market capitalization of less than $18 billion. Securities of companies whose market capitalization no longer meets this definition after purchase may continue to be held by the Fund. In addition, while the Fund will invest primarily in the equity securities of U.S. Small/Mid cap companies, the Fund may also from time to time invest up to a maximum of 20% of its assets in the equity securities of non-U.S. companies that trade in the U.S. (such as American Depository Receipts or substantially similar instruments that are based on foreign securities) or in securities of companies above the capitalization range of the Russell 2500^® Growth Index. The Fund may also invest in companies with limited or no operating histories. The Fund does not employ any industry or sector focus but may from time to time have greater exposure to the securities of issuers within the same industry or sector. The Fund frequently and actively trades its portfolio securities.

Investment decisions for the Fund’s growth style of investing are based on the belief that fundamentally strong companies are more likely to generate superior earnings growth on a sustained basis and are more likely to experience positive earnings revisions. These decisions involve evaluating a company’s competitive position, evaluating industry dynamics, identifying potential growth catalysts and assessing the financial position of the company. The investment decision is also based on the evaluation of relative valuation, macroeconomic and behavioral factors affecting the company and its stock price. The Fund sells holdings for a variety of reasons, including to take profits, changes to the fundamental investment thesis, changes in the risk/reward assessment of the holding, an assessment that the holding is efficiently priced, to make room for more attractive ideas or for other portfolio or risk management considerations.

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

All investments, including those in mutual funds, have risks. No investment is suitable for all investors. The Fund is intended for long-term investors who can accept the risks involved in investing in Small/Mid cap securities. Of course, there can be no assurance that the Fund will achieve its objective. You may lose money by investing in the Fund. Below are the main risks of investing in the Fund:

Market Risk. The Fund is subject to market risk, which is the possibility that stock prices overall will decline over short or long periods. Stock markets tend to move in cycles, with periods of rising prices and periods of falling prices. These fluctuations are expected to have a substantial influence on the value of the Fund’s shares. Due to the uncertainty caused by war, acts of terrorism, geopolitical conflict, public health issues, recessions, global pandemics and other risks, global markets may experience increased volatility which could adversely affect the performance of the Fund’s investments.

Growth Stock Risk. Growth stocks are typically priced higher than other stocks, in relation to earnings and other measures, because investors believe they have more growth potential. This potential may or may not be realized and, if it is not realized, may result in a loss to the Fund. Growth stock prices also tend to be more volatile than the overall market.

Small- and Medium-Sized Company Risk. The Fund invests in companies that are smaller, less established, with limited operating histories and less liquid markets for their stock, and therefore may be riskier investments. While small- and medium-sized companies generally have the potential for rapid growth, the securities of these companies often involve greater risks than investments in larger, more established companies because small- and medium-sized companies may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. In addition, the frequency and volume of their trading is substantially less than is typical of larger companies. The value of securities of smaller, less well-known issuers can be more volatile than that of larger issuers.

Allocation Risk. The Fund’s overall risk level will depend on the companies, countries, regions, markets, market sectors, industries and asset classes in which the Fund is invested. Because the Fund may have significant weightings in a particular company, country, region, asset class, industry, market or market sector, the value of the Fund’s shares may be affected by events that adversely affect that company, country, region, market, industry, asset class, or market sector and may fluctuate more than that of a less focused fund. The Fund is expected to have significant exposure to the healthcare sector. Health care companies may be negatively impacted by scientific or technological developments, research and development costs, increased competition, rapid product obsolescence and patent expirations. The Fund is also expected to have significant exposure to the information technology sector. Technology companies may be subject to abrupt market movements, short product cycles, changing consumer preferences, aggressive pricing of products and services, a limited qualified workforce, new market entrants and intellectual property disputes.

Equity Securities Risk. In a company liquidation, the claims of secured and unsecured creditors and owners of bonds and preferred stocks take precedence over the claims of common stock shareholders.

Manager Risk. How the Fund’s investment adviser manages the Fund will impact the Fund’s performance. The Fund may lose money if the investment adviser’s investment strategy does not achieve the Fund’s objective or the investment adviser does not implement the strategy successfully.

High Rates of Turnover. It is anticipated that the Fund will experience high rates of portfolio turnover, which may result in payment by the Fund of above-average transaction costs and could result in the payment by shareholders of taxes on above-average amounts of realized investment gains, including net short-term capital gains, which are taxed as ordinary income for federal income tax purposes when distributed to shareholders.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility—or variability—of the Fund’s annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.driehaus.com/performance

Bar Chart [Heading]

rr_BarChartHeading

Annual Returns for the years ended December 31

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns as of December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

1 Year

rr_AverageAnnualReturnYear01

5.04%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 01, 2020

Prospectus [Line Items]

rr_ProspectusLineItems

Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage)

rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther

none

Exchange Fee

rr_ExchangeFee

none

Other Expenses (as a percentage of Assets):

rr_OtherExpensesOverAssets

0.71%

Fee Waiver or Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.36%)

^[8]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 97

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

684

Annual Return 2021

rr_AnnualReturn2021

18.32%

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2021

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

lowest return

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

1.80%

Since Inception

rr_AverageAnnualReturnSinceInception

54.17%

1 Year

rr_AverageAnnualReturnYear01

15.04%

Inception Date

rr_AverageAnnualReturnInceptionDate

May 01, 2020

Prospectus [Line Items]

rr_ProspectusLineItems

Since Inception

rr_AverageAnnualReturnSinceInception

41.31%

Risk/Return [Heading]

rr_RiskReturnHeading

Driehaus Event Driven Fund Ticker: DEVDX

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Driehaus Event Driven Fund seeks to provide positive returns over full-market cycles.

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold 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.

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)

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 rate 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 most recent fiscal year, the Fund’s portfolio turnover rate was 109% of the average value of its portfolio.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

The information in the Financial Highlights does not include Acquired Fund Fees and Expenses, and therefore, Total Annual Fund Operating Expenses do not correlate to the “ratio of expenses to average net assets” provided in the Financial Highlights.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategy

Risk [Heading]

rr_RiskHeading

Principal Risks

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows the volatility—or variability—of the Fund’s Investor Shares annual total returns over time and shows that Fund performance can change from year to year. The table shows the Fund’s average annual total returns for certain time periods compared to the returns of a broad-based securities index.

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

www.driehaus.com/performance

Bar Chart [Heading]

rr_BarChartHeading

Annual Returns for the years ended December 31

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns as of December 31, 2021

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).

Performance Table Closing [Text Block]

rr_PerformanceTableClosingTextBlock

The table shows returns on a before-tax and after-tax basis. After-tax returns are shown only for Investor Shares and after-tax returns for Institutional Shares will vary from Investor Shares. After-tax returns are calculated using the highest historic marginal individual federal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown in the table. After-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).