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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FMI FOCUS FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
  FMI Focus Fund (the “Fund”) seeks capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund: The following table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.
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 55% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 55.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in 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 may invest in stocks of companies of all sizes, but primarily invests in small- to medium-capitalization (namely, less than $5 billion market capitalization) United States companies, that have substantial capital appreciation potential.  Many of these companies have little or no following by the major stock brokerage firms.  The Fund looks for stocks of businesses that are selling at what it believes are substantial discounts to prices that accurately reflect their future earnings prospects.  The Fund takes a “focused” approach to investing, meaning the Fund conducts extensive research (namely, focuses) on each prospective investment before purchasing.

The Fund’s portfolio managers actively trade the Fund’s portfolio.  The Fund’s portfolio managers may also use the following investment techniques:

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Effect “short sales” of a security when they think it will decline in value.

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Purchase securities with borrowed funds.

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Purchase put and call options and write call options on securities and stock indexes.

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:

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The security has achieved its value potential.

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Such sale is necessary for portfolio diversification.

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Changing fundamentals signal a deteriorating value potential.

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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 and a high tolerance for risk:

 
•
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, or sector of the market.

 
•
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.

 
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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.

 
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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.

 
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Leverage Risk:  When our portfolio managers purchase securities with borrowed funds, they engage in a speculative investment practice called “leverage.” When the Fund engages in “leverage,” it has the potential to incur losses greater than if it had not engaged in leverage.

 
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Options Writing and Selling Risk:  If the Fund purchases an option and the price of the underlying stock or index moves in the wrong direction, the Fund will lose most or all of the amount the Fund paid for the option, plus commission costs. Similarly, the Fund likely will lose money if the underlying stock or index of a call option it has written increases in value. It is possible that there may be times when a market for the Fund’s outstanding options does not exist.

 
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Short Sales Risk:  The risk of incurring losses due to an appreciation in value of a security that was sold short.  Losses may incur if a short position is closed out earlier than the Fund had intended.  The potential loss is unlimited.
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 Fund’s performance from year to year and how the Fund’s average annual returns over time compare to the performance of the Russell 2000 Index and the Russell 2000 Growth Index.  For additional information on these indexes, please see “Index Descriptions” in this Prospectus.  The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.  Updated performance information is available on the Fund’s website at http://www.fmifunds.com.
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 Fund's performance from year to year and how the Fund's average annual returns over time compare to the performance of the Russell 2000 Index and the Russell 2000 Growth Index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress http://www.fmifunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading FMI Focus Fund (Annual total return as of 12/31)
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
During the ten year period shown on the bar chart, the Fund’s highest total return for a quarter was 25.25% (quarter ended September 30, 2009) and the lowest total return for a quarter was -23.77% (quarter ended December 31, 2008).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return for a quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.25%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return for a quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (23.77%)
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 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 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).
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended December 31, 2012 )
Russell 2000 Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.35%
5 Years rr_AverageAnnualReturnYear05 3.56%
10 Years rr_AverageAnnualReturnYear10 9.72%
Russell 2000 Growth Index
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.59%
5 Years rr_AverageAnnualReturnYear05 3.49%
10 Years rr_AverageAnnualReturnYear10 9.80%
FMI FOCUS FUND
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Maximum Sales Charge (Load) Imposed on Reinvested Dividends and Distributions rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fee (transfer agent charge of $15 for each wire redemption) rr_RedemptionFeeOverRedemption none
Exchange Fee rr_ExchangeFee none
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.26%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.26%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 128
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 400
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 692
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,523
Annual Return 2003 rr_AnnualReturn2003 48.11%
Annual Return 2004 rr_AnnualReturn2004 7.05%
Annual Return 2005 rr_AnnualReturn2005 4.93%
Annual Return 2006 rr_AnnualReturn2006 12.78%
Annual Return 2007 rr_AnnualReturn2007 3.38%
Annual Return 2008 rr_AnnualReturn2008 (30.47%)
Annual Return 2009 rr_AnnualReturn2009 40.16%
Annual Return 2010 rr_AnnualReturn2010 29.55%
Annual Return 2011 rr_AnnualReturn2011 (3.37%)
Annual Return 2012 rr_AnnualReturn2012 13.33%
1 Year rr_AverageAnnualReturnYear01 13.33%
5 Years rr_AverageAnnualReturnYear05 6.69%
10 Years rr_AverageAnnualReturnYear10 10.37%
FMI FOCUS FUND | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.85%
5 Years rr_AverageAnnualReturnYear05 5.74%
10 Years rr_AverageAnnualReturnYear10 9.17%
FMI FOCUS FUND | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.25%
5 Years rr_AverageAnnualReturnYear05 5.46%
10 Years rr_AverageAnnualReturnYear10 8.79%