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Label Element Value
Large Cap Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading LARGE CAP FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock FMI Large Cap Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 28% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 28.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions 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.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in 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.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests mainly in a limited number of large capitalization (namely, companies with more than $5 billion market capitalization at the time of initial purchase) value stocks of companies listed or traded on a national securities exchange or on a national securities association, including foreign securities traded on a national securities exchange or on a national securities association. Under normal market conditions, the Fund invests 80% of its net assets in large capitalization companies, including for purposes of this limitation common stocks of foreign companies, which the Fund principally invests in through American Depositary Receipts “ADRs”) or American Depositary Shares (“ADSs”). ADRs and ADSs are dollar-denominated securities of foreign issuers traded in the U.S. The Fund may also invest in medium capitalization companies.
The Fund may invest in ADRs through both sponsored and unsponsored arrangements. Issuers of the securities underlying sponsored ADRs, but not unsponsored ADRs, are contractually obligated to disclose material information in the United States. Therefore, the market value of unsponsored ADRs is less likely to reflect the effect of such information.
The Fund uses fundamental analysis to look for stocks of good businesses that are selling at value prices in an effort to achieve above average performance with below average risk. The Fund believes good businesses have some or all of the following characteristics:
•A strong, defendable market niche or products and services niche that is difficult to replicate
•A high degree of relative recurring revenue
•Modestly priced products or services
•Attractive return-on-investment economics (namely, where return on investment exceeds a company’s cost of capital over a three to five year period)
•Above-average growth or improving profitability prospects
The Fund considers valuation:
•On both an absolute and relative to the market basis
•Utilizing both historical and prospective analysis
In reviewing companies, the Fund applies the characteristics identified above on a case-by-case basis as the order of importance varies depending on the type of business or industry and the company being reviewed.
The Fund is non-diversified which means that it may invest a significant portion of its assets in the securities of a single issuer or small number of issuers.
The Fund’s portfolio managers will generally sell a portfolio security when they believe:
•The security has achieved its value potential
•Such sale is necessary for portfolio diversification
•Changing fundamentals signal a deteriorating value potential
•Other securities have a better value potential
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock There is a risk that you could lose all or a portion of your money on your investment in the Fund. This risk may increase during times of significant market volatility. The risks below could affect the value of your investment, and because of these risks the Fund is a suitable investment only for those investors who have long-term investment goals:
•Stock Market Risk: The prices of the securities in which the Fund invests may decline for a number of reasons. The price declines of common stocks, in particular, may be steep, sudden and/or prolonged. Price changes may occur in the market as a whole, or they may occur in only a particular company, industry, sector, or geographical region of the market. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the Fund invests and exacerbate other risks that apply to the Fund. These effects could negatively impact the Fund’s performance.
•Medium Capitalization Companies Risk: Medium capitalization companies tend to be more susceptible to adverse business or economic events than large capitalization companies, and there is a risk that the securities of medium capitalization companies may have limited liquidity and greater price volatility than securities of large capitalization companies.
•Large Capitalization Companies Risk: Large capitalization companies may grow more slowly than the overall economy and tend to go in and out of favor based on market and economic conditions, and the Fund may underperform investments that focus on small or medium capitalization companies.
•Non-Diversification Risk: Because the Fund is non-diversified (meaning that compared to diversified mutual funds, the Fund may invest a greater percentage of its assets in a more limited number of issuers), the Fund’s shares may be more susceptible to adverse changes in the value of a particular security than would be the shares of a diversified mutual fund. Thus, the Fund may be more volatile because each stock in which it invests will have greater impact on the Fund’s performance.
•Value Investing Risk: The Fund’s portfolio managers may be wrong in their assessment of a company’s value and the stocks the Fund holds may not reach what the portfolio managers believe are their full values. From time to time “value” investing falls out of favor with investors. During these periods, the Fund’s relative performance may suffer.
•Foreign Securities Risk: Stocks of non-U.S. companies (whether held directly or in ADRs or ADSs) as an asset class may underperform stocks of U.S. companies, and such stocks may be less liquid and more volatile than stocks of U.S. companies. The costs associated with securities transactions are often higher in foreign countries than in the U.S. The U.S. dollar value of foreign securities traded in foreign currencies (and any dividends and interest earned) held by the Fund or by exchange-traded funds (“ETFs”) in which the Fund invests may be affected unfavorably by changes in foreign currency exchange rates. An increase in the U.S. dollar relative to these other currencies will adversely affect the Fund, if the positions are not fully hedged. Additionally, investments in foreign securities, whether or not publicly traded in the United States, may involve risks which are in addition to those inherent in domestic investments. Foreign companies may be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing the earnings potential of such foreign companies. Substantial withholding taxes may apply to distributions from foreign companies. Foreign companies may not be subject to the same regulatory requirements as those of U.S. companies and, as a consequence, there may be less publicly available information about such companies. Also, foreign companies may not be subject to uniform accounting, auditing and financial reporting standards and requirements comparable to those applicable to U.S. companies. Policy and legislative changes in foreign countries and other events affecting global markets, such as the institution of tariffs by the U.S. or the United Kingdom’s exit from the European Union (or “Brexit”), may contribute to decreased liquidity and increased volatility in the financial markets.
Foreign governments and foreign economies often are less stable than the U.S. Government and the U.S. economy. •Liquidity Risk: Liquidity risk is the risk, due to certain investments trading in lower volumes or to market and economic conditions, that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects based on the Fund’s valuation of the investments. Events that may lead to increased redemptions, such as market disruptions, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Liquidity issues may also make it difficult to value the Fund’s investments.
Risk Lose Money [Text] rr_RiskLoseMoney There is a risk that you could lose all or a portion of your money on your investment in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Because the Fund is non-diversified (meaning that compared to diversified mutual funds, the Fund may invest a greater percentage of its assets in a more limited number of issuers), the Fund’s shares may be more susceptible to adverse changes in the value of a particular security than would be the shares of a diversified mutual fund. Thus, the Fund may be more volatile because each stock in which it invests will have greater impact on the Fund’s performance.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Investor Class shares from year to year and how the average annual returns of the Fund’s Investor Class shares over time compare to the performance of the Standard & Poor’s Composite® Index of 500 Stocks (“S&P 500®”) and the Russell 1000® Value Index. The performance of the Fund’s Institutional Shares will differ from those shown to the extent that the classes of shares do not have the same expenses or inception date. For additional information on the index, please see “Index Descriptions” in the Prospectus. The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Performance may be higher or lower in the future. Updated performance information is available on the Fund’s website at www.fmifunds.com/current-performance/.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Investor Class shares from year to year and how the average annual returns of the Fund’s Investor Class shares over time compare to the performance of the Standard & Poor’s Composite® Index of 500 Stocks (“S&P 500®”) and the Russell 1000® Value Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fmifunds.com/current-performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading FMI Large Cap Fund – Investor Class (Annual total return as of 12/31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the ten year period shown on the bar chart, the highest total return for the Fund’s Investor Class shares for a quarter was 15.81% (quarter ended December 31, 2020) and the lowest total return for a quarter was -23.43% (quarter ended March 31, 2020).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.81%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.43%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the periods ended December 31, 2020)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Fund’s return after taxes on distributions and sale of Fund shares may be higher than the other return figures for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s individual tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts (“IRAs”). After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary. The Fund’s return after taxes on distributions and sale of Fund shares may be higher than the other return figures for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares.
Large Cap Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500® Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.22%
10 Years rr_AverageAnnualReturnYear10 13.88%
Since Inception rr_AverageAnnualReturnSinceInception 16.91%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Large Cap Fund | Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 1000® Value Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 2.80%
5 Years rr_AverageAnnualReturnYear05 9.74%
10 Years rr_AverageAnnualReturnYear10 10.50%
Since Inception rr_AverageAnnualReturnSinceInception 9.68%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Large Cap Fund | Large Cap Fund Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIHX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.63%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.14%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.04%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.18%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,002
Annual Return 2011 rr_AnnualReturn2011 1.49%
Annual Return 2012 rr_AnnualReturn2012 14.86%
Annual Return 2013 rr_AnnualReturn2013 30.48%
Annual Return 2014 rr_AnnualReturn2014 12.36%
Annual Return 2015 rr_AnnualReturn2015 (2.44%)
Annual Return 2016 rr_AnnualReturn2016 13.79%
Annual Return 2017 rr_AnnualReturn2017 19.19%
Annual Return 2018 rr_AnnualReturn2018 (3.88%)
Annual Return 2019 rr_AnnualReturn2019 23.66%
Annual Return 2020 rr_AnnualReturn2020 10.24%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 10.24%
5 Years rr_AverageAnnualReturnYear05 12.19%
10 Years rr_AverageAnnualReturnYear10 11.48%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Large Cap Fund | Large Cap Fund Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions
1 Year rr_AverageAnnualReturnYear01 7.49%
5 Years rr_AverageAnnualReturnYear05 9.51%
10 Years rr_AverageAnnualReturnYear10 9.35%
Large Cap Fund | Large Cap Fund Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
1 Year rr_AverageAnnualReturnYear01 7.98%
5 Years rr_AverageAnnualReturnYear05 9.31%
10 Years rr_AverageAnnualReturnYear10 9.05%
Large Cap Fund | Large Cap Fund Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIQX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.63%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.04%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.04%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 214
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 373
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 835
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 10.42%
Since Inception rr_AverageAnnualReturnSinceInception 13.34%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Common Stock Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading COMMON STOCK FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock FMI Common Stock Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 32% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions 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.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in 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 these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests mainly in small- to medium-capitalization companies (namely, companies with less than $7 billion market capitalization at the time of initial purchase) listed or traded on a national securities exchange or on a national securities association. Under normal market conditions, the Fund invests 80% of its net assets in common stocks, including for purposes of this limitation common stocks of foreign companies, which the Fund principally invests in through American Depositary Receipts (“ADRs”) or American Depositary Shares (“ADSs”). ADRs and ADSs are dollar-denominated securities of foreign issuers traded in the U.S.
The Fund may invest in ADRs through both sponsored and unsponsored arrangements. Issuers of the securities underlying sponsored ADRs, but not unsponsored ADRs, are contractually obligated to disclose material information in the United States. Therefore, the market value of unsponsored ADRs is less likely to reflect the effect of such information.
The Fund uses fundamental analysis to look for stocks of good businesses that are selling at value prices in an effort to achieve above average performance with below average risk. The Fund believes good businesses have some or all of the following characteristics:
•A strong, defendable market niche or products and services niche that is difficult to replicate
•A high degree of relative recurring revenue
•Modestly priced products or services
•Attractive return-on-investment economics (namely, where return on investment exceeds a company’s cost of capital over a three to five year period)
•Above-average growth or improving profitability prospects
The Fund considers valuation:
•On both an absolute and relative to the market basis
•Utilizing both historical and prospective analysis
In reviewing companies, the Fund applies the characteristics identified above on a case-by-case basis as the order of importance varies depending on the type of business or industry and the company being reviewed.
The Fund’s portfolio managers will generally sell a portfolio security when they believe:
•The security has achieved its value potential
•Such sale is necessary for portfolio diversification
•Changing fundamentals signal a deteriorating value potential
•Other securities have a better value potential
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock There is a risk that you could lose all or a portion of your money on your investment in the Fund. This risk may increase during times of significant market volatility. The risks below could affect the value of your investment, and because of these risks the Fund is a suitable investment only for those investors who have long-term investment goals:
•Stock Market Risk: The prices of the securities in which the Fund invests may decline for a number of reasons. The price declines of common stocks, in particular, may be steep, sudden and/or prolonged. Price changes may occur in the market as a whole, or they may occur in only a particular company, industry, sector, or geographical region of the market. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the Fund invests and exacerbate other risks that apply to the Fund. These effects could negatively impact the Fund’s performance.
•Medium Capitalization Companies Risk: Medium capitalization companies tend to be more susceptible to adverse business or economic events than large capitalization companies, and there is a risk that the securities of medium capitalization companies may have limited liquidity and greater price volatility than securities of large capitalization companies.
•Small Capitalization Companies Risk: Small capitalization companies typically have relatively lower revenues, limited product lines and lack of management depth, and may have a smaller share of the market for their products or services, than large and medium capitalization companies. There is a risk that the securities of small capitalization companies may have limited liquidity and greater price volatility than securities of large and medium capitalization companies, which can negatively affect the Fund’s ability to sell these securities at quoted market prices. Finally, there are periods when investing in small capitalization company stocks falls out of favor with investors and these stocks may underperform.
•Value Investing Risk: The Fund’s portfolio managers may be wrong in their assessment of a company’s value and the stocks the Fund holds may not reach what the portfolio managers believe are their full values. From time to time “value” investing falls out of favor with investors. During these periods, the Fund’s relative performance may suffer.
•Foreign Securities Risk: Stocks of non-U.S. companies (whether held directly or in ADRs or ADSs) as an asset class may underperform stocks of U.S. companies, and such stocks may be less liquid and more volatile than stocks of U.S. companies. The costs associated with securities transactions are often higher in foreign countries than in the U.S. The U.S. dollar value of foreign securities traded in foreign currencies (and any dividends and interest earned) held by the Fund or by exchange-traded funds (“ETFs”) in which the Fund invests may be affected unfavorably by changes in foreign currency exchange rates. An increase in the U.S. dollar relative to these other currencies will adversely affect the Fund, if the positions are not fully hedged. Additionally, investments in foreign securities, whether or not publicly traded in the United States, may involve risks which are in addition to those inherent in domestic investments. Foreign companies may be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing the earnings potential of such foreign companies. Substantial withholding taxes may apply to distributions from foreign companies. Foreign companies may not be subject to the same regulatory requirements as those of U.S. companies and, as a consequence, there may be less publicly available information about such companies. Also, foreign companies may not be subject to uniform accounting, auditing and financial reporting standards and requirements comparable to those applicable to U.S. companies. Policy and legislative changes in foreign countries and other events affecting global markets, such as the institution of tariffs by the U.S. or the United Kingdom’s exit from the European Union (or “Brexit”), may contribute to decreased liquidity and increased volatility in the financial markets. Foreign governments and foreign economies often are less stable than the U.S. Government and the U.S. economy.
•Liquidity Risk: Liquidity risk is the risk, due to certain investments trading in lower volumes or to market and economic conditions, that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects based on the Fund’s valuation of the investments. Events that may lead to increased redemptions, such as market disruptions, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under
adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Liquidity issues may also make it difficult to value the Fund’s investments.
Risk Lose Money [Text] rr_RiskLoseMoney There is a risk that you could lose all or a portion of your money on your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Investor Class shares from year to year and how the average annual returns of the Fund’s Investor Class shares over time compare to the performance of the Russell 2000® Index and the Russell 2000® Value Index. The performance of the Fund’s Institutional Shares will differ from those shown to the extent that the classes of shares do not have the same expenses or inception date. For additional information on the index, please see “Index Descriptions” in the Prospectus. The Fund is the successor to the FMI Common Stock Fund, the sole series of FMI Common Stock Fund, Inc. (the “Predecessor Fund”). The Predecessor Fund commenced operations on December 18, 1981. The reorganization was effective as of January 31, 2014, and the Fund is the accounting survivor of the reorganization. Accordingly, the performance information shown below for periods on or prior to January 31, 2014 is that of the Predecessor Fund. The Predecessor Fund was also advised by the Adviser and had the same investment objective and strategies as the Fund. The past performance of the Fund and the Predecessor Fund (before and after taxes) are not necessarily an indication of future performance. Performance may be higher or lower in the future. Updated performance information is available on the Fund’s website at www.fmifunds.com/current-performance/.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Investor Class shares from year to year and how the average annual returns of the Fund’s Investor Class shares over time compare to the performance of the Russell 2000® Index and the Russell 2000® Value Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fmifunds.com/current-performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The past performance of the Fund and the Predecessor Fund (before and after taxes) are not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading FMI Common Stock Fund – Investor Class (Annual total return as of 12/31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the ten year period shown on the bar chart, the highest total return for the Fund’s Investor Class shares for a quarter was 24.90% (quarter ended December 31, 2020) and the lowest total return for a quarter was -27.14% (quarter ended March 31, 2020).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 24.90%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (27.14%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the periods ended December 31, 2020)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal 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. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or IRAs. After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.
Common Stock Fund | Russell 2000® Index (reflects no deductions for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000® Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 19.96%
5 Years rr_AverageAnnualReturnYear05 13.26%
10 Years rr_AverageAnnualReturnYear10 11.20%
Since Inception rr_AverageAnnualReturnSinceInception 14.46%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Common Stock Fund | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 4.63%
5 Years rr_AverageAnnualReturnYear05 9.65%
10 Years rr_AverageAnnualReturnYear10 8.66%
Since Inception rr_AverageAnnualReturnSinceInception 8.77%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Common Stock Fund | Common Stock Fund Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIMX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.83%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.11%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.08%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.19%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
Annual Return 2011 rr_AnnualReturn2011 4.52%
Annual Return 2012 rr_AnnualReturn2012 10.16%
Annual Return 2013 rr_AnnualReturn2013 32.01%
Annual Return 2014 rr_AnnualReturn2014 6.47%
Annual Return 2015 rr_AnnualReturn2015 (6.84%)
Annual Return 2016 rr_AnnualReturn2016 20.20%
Annual Return 2017 rr_AnnualReturn2017 13.77%
Annual Return 2018 rr_AnnualReturn2018 (8.65%)
Annual Return 2019 rr_AnnualReturn2019 24.82%
Annual Return 2020 rr_AnnualReturn2020 5.79%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 5.79%
5 Years rr_AverageAnnualReturnYear05 10.53%
10 Years rr_AverageAnnualReturnYear10 9.54%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
Common Stock Fund | Common Stock Fund Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions
1 Year rr_AverageAnnualReturnYear01 5.60%
5 Years rr_AverageAnnualReturnYear05 8.96%
10 Years rr_AverageAnnualReturnYear10 7.67%
Common Stock Fund | Common Stock Fund Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
1 Year rr_AverageAnnualReturnYear01 3.56%
5 Years rr_AverageAnnualReturnYear05 8.14%
10 Years rr_AverageAnnualReturnYear10 7.43%
Common Stock Fund | Common Stock Fund Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIUX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.83%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.07%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.07%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 287
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 498
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,108
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 5.91%
Since Inception rr_AverageAnnualReturnSinceInception 10.73%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
International Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading INTERNATIONAL FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock FMI International Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 23% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 23.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions 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.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in 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 these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests mainly in a limited number of large capitalization (namely, companies with more than $5 billion market capitalization at the time of initial purchase) value stocks of foreign companies (also referred to as non-U.S. companies). The Fund normally invests at least 65% of its total assets in the equity securities of non-U.S. companies. Non-U.S. companies are companies domiciled or headquartered outside of the United States, or whose primary business activities or principal trading markets are located outside of the United States. Sometimes these non-U.S. companies are traded in the U.S. on a national securities exchange, or through American Depositary Receipts (“ADRs”) or American Depositary Shares (“ADSs”). The Fund invests in common stocks and other equity securities, including preferred stocks, convertible preferred stocks, warrants, ADRs, ADSs and exchange-traded funds (“ETFs”) based on an international equity index. The Fund may seek to protect itself against the adverse effects of currency exchange rate fluctuations by entering into currency hedging transactions.
The Fund may invest in ADRs through both sponsored and unsponsored arrangements. Issuers of the securities underlying sponsored ADRs, but not unsponsored ADRs, are contractually obligated to disclose material information in the United States. Therefore, the market value of unsponsored ADRs is less likely to reflect the effect of such information.
Unlike many international funds, the majority of the Fund’s investments will be in companies that have global operations rather than in companies whose business is limited to a particular country or geographic region. Because the Fund’s investments will be limited in number and investing in emerging market securities will not be a principal investment strategy, a substantial amount of the Fund’s assets (namely, more than 25% of its assets) may be in issuers located in a limited number of countries, and it is likely that the geographical and industry weightings of the Fund will differ significantly from popular international benchmarks. When determining whether an investment is in emerging market securities, the Fund views an investment in the securities of a company domiciled or headquartered in an emerging market, or whose primary business activities or principal trading markets are located in an emerging market as an investment in an emerging market.
The Fund uses fundamental analysis to look for stocks of good businesses that are selling at value prices in an effort to achieve above average performance with below average risk. The Fund believes good businesses have some or all of the following characteristics:
•A strong, defendable market niche or products and services niche that is difficult to replicate
•A high degree of relative recurring revenue
•Modestly priced products or services
•Attractive return-on-investment economics (namely, where return on investment exceeds a company’s cost of capital over a three to five year period)
•Above-average growth or improving profitability prospects
The Fund considers valuation:
•On both an absolute and relative to the market basis
•Utilizing both historical and prospective analysis
In reviewing companies, the Fund applies the characteristics identified above on a case-by-case basis as the order of importance varies depending on the type of business or industry and the company being reviewed.
The Fund’s portfolio managers will generally sell a portfolio security when they believe:
•The security has achieved its value potential
•Such sale is necessary for portfolio diversification
•Changing fundamentals signal a deteriorating value potential
•Other securities have a better value potential
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock There is a risk that you could lose all or a portion of your money on your investment in the Fund. This risk may increase during times of significant market volatility. The risks below could affect the value of your investment, and because of these risks the Fund is a suitable investment only for those investors who have long-term investment goals:
•Stock Market Risk: The prices of the securities in which the Fund invests may decline for a number of reasons. The price declines of common stocks, in particular, may be steep, sudden and/or prolonged. Price changes may occur in the market as a whole, or they may occur in only a particular company, industry, sector, or geographical region of the market. A rise in protectionist trade policies slowing global economic growth, risk associated with the United Kingdom's vote to leave the European Union, the trade dispute between the United States and China, the risk of trade disputes with other countries, and the possibility of changes to some international trade agreements, could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the Fund invests and exacerbate other risks that apply to the Fund. These effects could negatively impact the Fund’s performance.
•Value Investing Risk: The Fund’s portfolio managers may be wrong in their assessment of a company’s value and the stocks the Fund holds may not reach what the portfolio managers believe are their full values. From time to time “value” investing falls out of favor with investors. During these periods, the Fund’s relative performance may suffer.
•Foreign Securities Risk: Stocks of non-U.S. companies (whether held directly or in ADRs or ADSs) as an asset class may underperform stocks of U.S. companies, and such stocks may be less liquid and more volatile than stocks of U.S. companies. The costs associated with securities transactions are often higher in foreign countries than in the U.S. The U.S. dollar value of foreign securities traded in foreign currencies (and any dividends and interest earned) held by the Fund or by ETFs in which the Fund invests may be affected unfavorably by changes in foreign currency exchange rates. An increase in the U.S. dollar relative to these other currencies will adversely affect the Fund, if the positions are not fully hedged. Additionally, investments in foreign securities, whether or not publicly traded in the United States, may involve risks which are in addition to those inherent in domestic investments, including foreign political and economic risk not associated with domestic investments, meaning that political events, social and economic events and natural disasters occurring in a country where the Fund invests could cause the Fund’s investments in that country to experience gains or losses. Foreign companies may be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing the earnings potential of such foreign companies. Substantial withholding taxes may apply to distributions from foreign companies. Foreign companies may not be subject to the same regulatory requirements as those of U.S. companies and, as a consequence, there may be less publicly available information about such companies. Also, foreign companies may not be subject to uniform accounting, auditing and financial reporting standards and requirements comparable to those applicable to U.S. companies. Policy and
legislative changes in foreign countries and other events affecting global markets, such as the institution of tariffs by the U.S. or the United Kingdom’s exit from the European Union (or “Brexit”), may contribute to decreased liquidity and increased volatility in the financial markets. Foreign governments and foreign economies often are less stable than the U.S. Government and the U.S. economy.
•Geographic Concentration Risk: Concentrating investments in a limited number of countries or particular geographic regions makes the Fund more susceptible to adverse economic, political, social, regulatory and other developments in that country, countries or region. Additionally, the Fund’s performance may be more volatile when the Fund’s investments are less diversified across countries.
•Currency Hedging Risk: The Fund generally hedges a significant portion of its foreign stock investments against foreign currency changes in an effort to have its returns more closely reflect the market performance of its investments, rather than the value of the currency. To the extent the Fund hedges portions of its portfolio, its relative performance may differ from that of unhedged portfolios or indices. There is no guarantee the hedges will fully protect against adverse currency movements.
•Large Capitalization Companies Risk: Large capitalization companies may grow more slowly than the overall economy and tend to go in and out of favor based on market and economic conditions, and the Fund may underperform investments that focus on small or medium capitalization companies.
•Liquidity Risk: Liquidity risk is the risk, due to certain investments trading in lower volumes or to market and economic conditions, that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects based on the Fund’s valuation of the investments. Events that may lead to increased redemptions, such as market disruptions, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Liquidity issues may also make it difficult to value the Fund’s investments.
Risk Lose Money [Text] rr_RiskLoseMoney There is a risk that you could lose all or a portion of your money on your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Investor Class from year to year and how the average annual returns of the Fund’s Investor Class over time compare to the performance of the Morgan Stanley Capital International Europe, Australasia and Far East® Index (“MSCI EAFE®”) and the MSCI EAFE® Value Index. The performance of the Fund’s Institutional Shares will differ from those shown to the extent that the classes of shares do not have the same expenses or inception date. For additional information on the index, please see “Index Descriptions” in the Prospectus. The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Performance may be higher or lower in the future. Updated performance information is available on the Fund’s website at www.fmifunds.com/current-performance/.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Investor Class from year to year and how the average annual returns of the Fund’s Investor Class over time compare to the performance of the Morgan Stanley Capital International Europe, Australasia and Far East® Index (“MSCI EAFE®”) and the MSCI EAFE® Value Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fmifunds.com/current-performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading FMI International Fund – Investor Class (Annual total return as of 12/31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the ten year period shown on the bar chart, the highest total return for the Fund’s Investor Class shares for a quarter was 16.94% (quarter ended December 31, 2020) and the lowest total return for a quarter was -28.24% (quarter ended March 31, 2020).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 16.94%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.24%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the periods ended December 31, 2020)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts IRAs.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal 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. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts IRAs. After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.
International Fund | MSCI EAFE® (LOC) (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE® (LOC) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 0.84%
5 Years rr_AverageAnnualReturnYear05 5.80%
10 Years rr_AverageAnnualReturnYear10 6.82%
Since Inception rr_AverageAnnualReturnSinceInception 7.12%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
International Fund | MSCI EAFE®(LOC) Value (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE®(LOC) Value (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (8.73%)
5 Years rr_AverageAnnualReturnYear05 2.73%
10 Years rr_AverageAnnualReturnYear10 4.72%
Since Inception rr_AverageAnnualReturnSinceInception 2.87%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
International Fund | MSCI EAFE® (USD) (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE® (USD) (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 7.82%
5 Years rr_AverageAnnualReturnYear05 7.45%
10 Years rr_AverageAnnualReturnYear10 5.51%
Since Inception rr_AverageAnnualReturnSinceInception 9.10%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
International Fund | MSCI EAFE® (USD) Value (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE® (USD) Value (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (2.63%)
5 Years rr_AverageAnnualReturnYear05 4.20%
10 Years rr_AverageAnnualReturnYear10 3.37%
Since Inception rr_AverageAnnualReturnSinceInception 4.80%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
International Fund | International Fund Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIYX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.71%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.14%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.06%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.20%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.91%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 93
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 290
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 504
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,120
Annual Return 2011 rr_AnnualReturn2011 (1.77%)
Annual Return 2012 rr_AnnualReturn2012 18.18%
Annual Return 2013 rr_AnnualReturn2013 24.65%
Annual Return 2014 rr_AnnualReturn2014 4.62%
Annual Return 2015 rr_AnnualReturn2015 3.22%
Annual Return 2016 rr_AnnualReturn2016 10.00%
Annual Return 2017 rr_AnnualReturn2017 15.45%
Annual Return 2018 rr_AnnualReturn2018 (9.46%)
Annual Return 2019 rr_AnnualReturn2019 17.07%
Annual Return 2020 rr_AnnualReturn2020 0.06%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 0.06%
5 Years rr_AverageAnnualReturnYear05 6.14%
10 Years rr_AverageAnnualReturnYear10 7.73%
International Fund | International Fund Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions
1 Year rr_AverageAnnualReturnYear01 0.06%
5 Years rr_AverageAnnualReturnYear05 5.19%
10 Years rr_AverageAnnualReturnYear10 6.99%
International Fund | International Fund Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
1 Year rr_AverageAnnualReturnYear01 0.04%
5 Years rr_AverageAnnualReturnYear05 4.57%
10 Years rr_AverageAnnualReturnYear10 6.10%
International Fund | International Fund Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIJX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.71%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.06%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.06%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.77%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 79
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 246
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 428
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 954
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 0.19%
Since Inception rr_AverageAnnualReturnSinceInception 5.66%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 31, 2016
FMI International Fund II - Currency Unhedged  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading FMI INTERNATIONAL FUND II – CURRENCY UNHEDGED
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock FMI International Fund II – Currency Unhedged seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The following table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees(fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses(expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination January 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance. For the inception date period from December 31, 2019 through September 30, 2020, the Fund’s portfolio turnover rate was 15% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 15.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions 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.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in 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 these periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s expenses are equal to net annual fund operating expenses for the first year and total annual fund operating expenses for the remaining years.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund invests mainly in a limited number of large capitalization (namely, companies with more than $5 billion market capitalization at the time of initial purchase) value stocks of foreign companies (also referred to as non-U.S. companies). The Fund normally invests at least 65% of its total assets in the equity securities of non-U.S. companies. Non-U.S. companies are companies domiciled or headquartered outside of the United States, or whose primary business activities or principal trading markets are located outside of the United States. Sometimes these non-U.S. companies are traded in the U.S. on a national securities exchange, or through American Depositary Receipts (“ADRs”) or American Depositary Shares (“ADSs”). The Fund invests in common stocks and other equity securities, including preferred stocks, convertible preferred stocks, warrants, ADRs, ADSs and exchange-traded funds (“ETFs”) based on an international equity index. The Fund will generally not hedge its perceived foreign currency exposure back into the U.S. dollar and will be exposed to currency fluctuations.
The Fund may invest in ADRs through both sponsored and unsponsored arrangements. Issuers of the securities underlying sponsored ADRs, but not unsponsored ADRs, are contractually obligated to disclose material information in the United States. Therefore, the market value of unsponsored ADRs is less likely to reflect the effect of such information.
Unlike many international funds, the majority of the Fund’s investments will be in companies that have global operations rather than in companies whose business is limited to a particular country or geographic region. Because the Fund’s investments will be limited in number and investing in emerging market securities will not be a principal investment strategy, a substantial amount of the Fund’s assets (namely, more than 25% of its assets) may be in issuers located in a limited number of countries, and it is likely that the geographical and industry weightings of the Fund will differ significantly from popular international benchmarks. When determining whether an investment is in emerging market securities, the Fund views an investment in the securities of a company domiciled or headquartered in an emerging
market, or whose primary business activities or principal trading markets are located in an emerging market as an investment in an emerging market.
The Fund uses fundamental analysis to look for stocks of good businesses that are selling at value prices in an effort to achieve above average performance with below average risk. The Fund believes good businesses have some or all of the following characteristics:
•A strong, defendable market niche or products and services niche that is difficult to replicate
•A high degree of relative recurring revenue
•Modestly priced products or services
•Attractive return-on-investment economics (namely, where return on investment exceeds a company’s cost of capital over a three to five year period)
•Above-average growth or improving profitability prospects
The Fund considers valuation:
•On both an absolute and relative to the market basis
•Utilizing both historical and prospective analysis
In reviewing companies, the Fund applies the characteristics identified above on a case-by-case basis as the order of importance varies depending on the type of business or industry and the company being reviewed.
The Fund is non-diversified which means that it may invest a significant portion of its assets in the securities of a single issuer or small number of issuers.
The Fund’s portfolio managers will generally sell a portfolio security when they believe:
•The security has achieved its value potential
•Such sale is necessary for portfolio diversification
•Changing fundamentals signal a deteriorating value potential
•Other securities have a better value potential
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock There is a risk that you could lose all or a portion of your money on your investment in the Fund. This risk may increase during times of significant market volatility. The risks below could affect the value of your investment, and because of these risks the Fund is a suitable investment only for those investors who have long-term investment goals: •Stock Market Risk: The prices of the securities in which the Fund invests may decline for a number of reasons. The price declines of common stocks, in particular, may be steep, sudden and/or prolonged. Price changes may occur in the market as a whole, or they may occur in only a particular company, industry, sector, or geographical region of the market. A rise in protectionist trade policies, slowing global economic growth, risks associated with the United Kingdom’s vote to leave the European Union, the trade dispute between the United States and China, the risk of trade disputes with other countries, and the possibility of changes to some international trade agreements, could affect the economies of many nations, including the United States, in ways that cannot necessarily be foreseen at the present time. The novel coronavirus (COVID-19) pandemic and efforts to contain its spread are likely to negatively affect the value, volatility, and liquidity of the securities and other assets in which the Fund invests and exacerbate other risks that apply to the Fund. These effects could negatively impact the Fund’s performance.
•Non-Diversification Risk: Because the Fund is non-diversified (meaning that compared to diversified mutual funds, the Fund may invest a greater percentage of its assets in a more limited number of issuers), the Fund’s shares may be more susceptible to adverse changes in the value of a particular security than would be the shares of a diversified mutual fund. Thus, the Fund may be more volatile because each stock in which it invests will have greater impact on the Fund’s performance.
•Value Investing Risk: The Fund’s portfolio managers may be wrong in their assessment of a company’s value and the stocks the Fund holds may not reach what the portfolio managers believe are their full values. From time to time “value” investing falls out of favor with investors. During these periods, the Fund’s relative performance may suffer.
•Foreign Securities Risk: Stocks of non-U.S. companies (whether held directly or in ADRs or ADSs) as an asset class may underperform stocks of U.S. companies, and such stocks may be less liquid and more volatile than stocks of U.S. companies. The costs associated with securities transactions are often higher in foreign countries than in the U.S. The U.S. dollar value of foreign securities traded in foreign currencies (and any dividends and interest earned) held by the Fund or by ETFs in which the Fund invests may be affected unfavorably by changes in foreign currency exchange rates. An increase in the U.S. dollar relative to these other currencies will adversely affect the Fund, as the positions are not hedged. Additionally, investments in foreign securities, whether or not publicly traded in the United States, may involve risks which are in addition to those inherent in domestic investments, including foreign political and economic risk not associated with domestic investments, meaning that political events, social and economic events and natural disasters occurring in a country where the Fund invests could cause the Fund’s investments in that country to experience gains or losses. Foreign companies may be subject to significantly higher levels of taxation than U.S. companies, including potentially confiscatory levels of taxation, thereby reducing the earnings potential of such foreign companies. Substantial withholding taxes may apply to distributions from foreign companies. Foreign companies may not be subject to the same regulatory requirements as those of U.S. companies and, as a consequence, there may be less publicly available information about such companies. Also, foreign companies may not be subject to uniform accounting, auditing and financial reporting standards and requirements comparable to those applicable to U.S. companies. Policy and legislative changes in foreign countries and other events affecting global markets, such as the institution of tariffs by the U.S. or the United Kingdom’s exit from the European Union (or “Brexit”), may contribute to decreased liquidity and increased volatility in the financial markets. Foreign governments and foreign economies often are less stable than the U.S. Government and the U.S. economy. The Fund generally will not hedge its perceived foreign currency exposure back into the U.S. dollar and therefore the Fund is considered to be “currency unhedged.”
•Geographic Concentration Risk: Concentrating investments in a limited number of countries or particular geographic regions makes the Fund more susceptible to adverse economic, political, social, regulatory and other developments in that country, countries or region. Additionally, the Fund’s performance may be more volatile when the Fund’s investments are less diversified across countries.
•Large Capitalization Companies Risk: Large capitalization companies may grow more slowly than the overall economy and tend to go in and out of favor based on market and economic conditions, and the Fund may underperform investments that focus on small or medium capitalization companies.
•Liquidity Risk: Liquidity risk is the risk, due to certain investments trading in lower volumes or to market and economic conditions, that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects based on the Fund’s valuation of the investments. Events that may lead to increased redemptions, such as market disruptions, may also negatively impact the liquidity of the Fund’s investments when it needs to dispose of them. If the Fund is forced to sell its investments at an unfavorable time and/or under adverse conditions in order to meet redemption requests, such sales could negatively affect the Fund. Liquidity issues may also make it difficult to value the Fund’s investments.
Risk Lose Money [Text] rr_RiskLoseMoney There is a risk that you could lose all or a portion of your money on your investment in the Fund.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus Because the Fund is non-diversified (meaning that compared to diversified mutual funds, the Fund may invest a greater percentage of its assets in a more limited number of issuers), the Fund’s shares may be more susceptible to adverse changes in the value of a particular security than would be the shares of a diversified mutual fund. Thus, the Fund may be more volatile because each stock in which it invests will have greater impact on the Fund’s performance.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Institutional Class from year to year and how the average annual returns of the Fund’s Institutional Class for one year compared to the performance of the Morgan Stanley Capital International Europe, Australasia and Far East® Index (“MSCI EAFE®”) and the MSCI EAFE® Value Index. No performance information is available for the Investor Class shares since that class is currently not available for purchase. For additional information on the index, please see “Index Descriptions” in the Prospectus. The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance. Performance may be higher or lower in the future. Updated performance information is available on the Fund’s website at www.fmifunds.com/current-performance/.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the performance of the Fund’s Institutional Class from year to year and how the average annual returns of the Fund’s Institutional Class for one year compared to the performance of the Morgan Stanley Capital International Europe, Australasia and Far East® Index (“MSCI EAFE®”) and the MSCI EAFE® Value Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.fmifunds.com/current-performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance.
Bar Chart [Heading] rr_BarChartHeading FMI International Fund II – Currency Unhedged – Institutional Class (Annual total return as of 12/31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the one year period shown on the bar chart, the highest total return for the Fund’s Institutional Class shares for a quarter was 20.58% (quarter ended December 31, 2020) and the lowest total return for a quarter was -29.25% (quarter ended March 31, 2020). The inception date of the Fund was December 31, 2019.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 20.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.25%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns(for the period ended December 31, 2020)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts IRAs.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Institutional Class shares only and there are no after-tax returns for Investor Class shares since the Class is currently not available for purchase.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock After-tax returns are calculated using the historical highest individual federal marginal 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. The after-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts IRAs. After-tax returns are shown for Institutional Class shares only and there are no after-tax returns for Investor Class shares since the Class is currently not available for purchase.
FMI International Fund II - Currency Unhedged | MSCI EAFE® (USD) (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE® (USD)(1) (reflects no deduction for fees, expenses or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 7.82% [1]
Since Inception rr_AverageAnnualReturnSinceInception 7.82% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019 [1]
FMI International Fund II - Currency Unhedged | MSCI EAFE® (USD) Value (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel MSCI EAFE® (USD) Value (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (2.63%)
Since Inception rr_AverageAnnualReturnSinceInception (2.63%)
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
FMI International Fund II - Currency Unhedged | Investor Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets 0.15%
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.68%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.83%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.58%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.58%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 442
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 806
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,829
Annual Return 2020 rr_AnnualReturn2020 3.94%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 3.94%
Since Inception rr_AverageAnnualReturnSinceInception 3.94%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 31, 2019
FMI International Fund II - Currency Unhedged | Investor Class | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions
1 Year rr_AverageAnnualReturnYear01 3.86%
Since Inception rr_AverageAnnualReturnSinceInception 3.86%
FMI International Fund II - Currency Unhedged | Investor Class | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
1 Year rr_AverageAnnualReturnYear01 2.61%
Since Inception rr_AverageAnnualReturnSinceInception 2.61%
FMI International Fund II - Currency Unhedged | Institutional Class  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol FMIFX
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (as a percentage of Offering Price) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge on Reinvested Dividends and Distributions (as a percentage) rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (as a percentage of Amount Redeemed) rr_RedemptionFeeOverRedemption none
Exchange Fee (as a percentage of Amount Redeemed) rr_ExchangeFeeOverRedemption none
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing Fees rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.68%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.68%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.43%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.53%) [2]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.90%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 92
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 400
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 731
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,667
[1] The Fund believes that the MSCI EAFE (USD) better represents the performance of a currency unhedged fund than the MSCI EAFE (LOC). The performance of the MSCI EAFE (LOC) for the one year period and since inception of the Fund was 0.84%.
[2] The Fund’s investment adviser has contractually agreed in the investment advisory agreement and operating expenses limitation agreement to waive its advisory fee to the extent necessary to ensure that net expenses (excluding federal, state and local taxes, interest, brokerage commissions and extraordinary items) do not exceed 1.75% of the average daily net assets of the Investor Class shares of the Fund and 1.65% of the average daily net assets of the Institutional Class shares of the Fund.  The investment advisory agreement may be terminated by the Fund or the Fund’s investment adviser for any reason upon sixty days prior written notice, but is expected to continue indefinitely, and the operating expenses limitation agreement may only be terminated by the Fund’s Board of Directors.  In addition to the reimbursement required under the investment advisory agreement, the investment adviser has voluntarily agreed to reimburse the Fund to the extent necessary to ensure that total annual fund operating expenses do not exceed 1.00% of the Investor Class shares (currently not available for purchase) and 0.90% of the Institutional Class shares at least through January 31, 2022.