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Label Element Value
Value Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The investment objective of the Fund is capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The tables below describe 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 Jul. 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transactions costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual Fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 14% of the average value of the portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 14.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Restated to reflect current expenses. Effective July 31, 2021, the Fund’s administrative services fees were revised.
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 periods indicated and then redeem in full at the end of each of the periods indicated. The example also assumes that your investment has a 5% return each year and the Fund’s operating expenses remain the same each year. The example reflects the contractual fee waiver and/or expense reimbursement arrangement, if applicable, for the current duration of the arrangement only.
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’s investment strategy (which we call “Quality at a Discount”) is to buy above-average to highest-quality businesses, at prices that we believe are less than what the companies are worth. Under normal circumstances, the Fund will invest the majority of its assets in common stock of larger companies. The Fund considers larger companies to be issuers with market capitalizations equal to or greater than the median company in the Russell 1000 Index, which was $15.207 billion as of June 30, 2021. The Fund may invest in securities issued by non-U.S. companies, which may be denominated in U.S. dollars or foreign currencies. As part of the Fund’s strategy, the Fund may concentrate its investments in securities of relatively few issuers.


We assess a company’s quality based on its competitive position, return on invested capital, ability to redeploy capital, cash flow consistency, financial leverage and management team. We compare the company’s stock price to our estimate of business value, i.e., all the cash that the company will generate for its owners in the future. For each company, we look at a range of business value estimates. We then seek to buy stocks of companies that meet our quality criteria when they are priced are at a discount to our estimates of business value.


We invest with a multiple-year time horizon. We believe that purchasing stocks at prices less than our business value estimates provides opportunities for stock price appreciation, both as business values grow and as the market recognizes companies’ values. Typically, we consider selling stocks as they approach or exceed our business value estimates. We may also sell stocks for other reasons, including for the purchase of stocks that we believe offer better investment opportunities.


We do not try to “time” the market. However, if there is cash available for investment and there are not securities that meet the Fund’s investment criteria, the Fund may invest without limitation in high-quality cash and cash equivalents such as U.S. government securities or government money market fund shares. If the Fund takes such a defensive position, it may be temporarily unable to achieve its investment objective.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

You should be aware that an investment in the Fund involves certain risks, including, among others, the following:


·Market Risk As with any mutual fund, investment return and principal value will fluctuate, depending on general market conditions and other factors. Market risk includes political, regulatory, economic, social and health risks (including the risks presented by the spread of infectious diseases) which can lead to increased market volatility and negative impacts on local and global financial markets, and the duration and severity of the impact of these risks on markets cannot be reasonably estimated. You may lose money if you invest in the Fund.

·Active Management Risk The investment adviser’s judgment about the attractiveness, value or potential appreciation of the Fund’s investments may prove to be incorrect. The Fund could underperform other funds with similar objectives or investment strategies, if the Fund’s overall investment selections or strategies fail to produce the intended results.

·Large Company Risk Securities of large companies tend to have less overall volatility compared to those of mid-size and small companies; however, large companies may not be able to attain the high growth rates of successful mid-size or small companies. In addition, large companies may be less capable of responding to competitive challenges and disruptive changes.

·Concentration Risk The risk that the Fund’s performance may be hurt disproportionately by the poor performance of relatively few stocks. The Fund tends to invest a high percentage of assets in its largest holdings.

·Non-U.S. Securities Risk The Fund may invest in securities issued by non-U.S. issuers, which securities may be denominated in U.S. dollars or foreign currencies. Investments in non-U.S. securities may involve additional risks including exchange rate fluctuation, political or economic instability, the imposition of exchange controls, expropriation, limited disclosure and illiquid markets.

·Failure to Meet Investment Objective There can be no assurance that the Fund will meet its investment objective.

Your investment in the Fund is not a bank deposit and is not insured nor guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other governmental agency.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money if you invest in the Fund.
RIsk Not Insured [Text] rr_RiskNotInsured Your investment in the Fund is not a bank deposit and is not insured nor guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other governmental agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year over the period indicated and by showing how the Fund’s average annual total returns for the periods indicated, both before and after taxes, compared to those of relevant broad-based securities market indices. The Standard & Poor’s 500 Index, the Fund’s primary comparative index, is generally representative of the market for the stocks of large-size U.S. companies. The Russell 1000 Index measures the performance of the large-cap segment of the U.S. equity market. All Fund performance numbers are calculated after deducting fees and expenses, and all numbers assume reinvestment of dividends. Total returns shown include fee waivers and expense reimbursements, if any; total returns would have been lower had there been no waivers and/or reimbursements. The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future both before and after taxes. Updated performance information is available at weitzinvestments.com or by calling us toll-free at 800-304-9745.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year over the period indicated and by showing how the Fund’s average annual total returns for the periods indicated, both before and after taxes, compared to those of relevant broad-based securities market indices. The Standard & Poor’s 500 Index, the Fund’s primary comparative index, is generally representative of the market for the stocks of large-size U.S. companies.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-304-9745
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress weitzinvestments.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance is not necessarily an indication of how the Fund will perform in the future both before and after taxes.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns – Investor Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The year-to-date return for the Fund’s Investor Class for the six months ended June 30, 2021 was 17.24%.


BEST AND WORST PERFORMING QUARTERS

(during the period shown above)

  Quarter/Year Total Return
Best quarter 2nd quarter 2020 19.11%
Worst quarter 1st quarter 2020 -18.98%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 17.24%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.11%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.98%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflect no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical 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 After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account (IRA).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In some instances, the return after taxes may be greater than the return before taxes because you are assumed to be able to use the capital loss on the sale of Fund shares to offset other taxable gains.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the highest historical 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. In some instances, the return after taxes may be greater than the return before taxes because you are assumed to be able to use the capital loss on the sale of Fund shares to offset other taxable gains. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as a 401(k) account or individual retirement account (IRA).
Average Annual Return, Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for periods ended December 31, 2020)
Value Fund | Standard & Poor’s 500 Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.40%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.22%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.88%
Value Fund | Russell 1000 Index  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 20.96%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.60%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 14.01%
Value Fund | Value Fund - Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.13% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 0.88%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.88%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 90
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 281
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 488
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,084
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.68% [3]
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.69% [3]
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.67% [3]
Value Fund | Value Fund - Investor Class  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) on purchase rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption fee rr_RedemptionFee none
Management fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.29% [1]
Total annual fund operating expenses rr_ExpensesOverAssets 1.04%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [2]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.04%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 106
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 331
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 574
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,271
Annual Return 2011 rr_AnnualReturn2011 6.12%
Annual Return 2012 rr_AnnualReturn2012 13.17%
Annual Return 2013 rr_AnnualReturn2013 31.75%
Annual Return 2014 rr_AnnualReturn2014 9.54%
Annual Return 2015 rr_AnnualReturn2015 (4.47%)
Annual Return 2016 rr_AnnualReturn2016 2.88%
Annual Return 2017 rr_AnnualReturn2017 15.55%
Annual Return 2018 rr_AnnualReturn2018 (4.87%)
Annual Return 2019 rr_AnnualReturn2019 34.13%
Annual Return 2020 rr_AnnualReturn2020 18.43%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.43%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 12.43%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.52%
Value Fund | Value Fund - Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 15.88%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.79%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.18%
Value Fund | Value Fund - Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.51%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.61%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.24%
[1] Restated to reflect current expenses. Effective July 31, 2021, the Fund’s administrative services fees were revised.
[2] The investment adviser has agreed in writing to waive its fees and reimburse certain expenses (excluding taxes, interest, brokerage costs, acquired fund fees and expenses and extraordinary expenses) to limit the total annual fund operating expenses for Institutional Class shares and Investor Class shares to 0.89% and 1.09%, respectively, of each Class’s average daily net assets through July 31, 2022. This agreement may only be terminated by the Board of Trustees of the Fund.
[3] Institutional Class shares first became available for sale on July 31, 2014. For performance prior to that date, this table includes the actual performance of the Fund’s Investor Class (and uses the actual expenses of the Fund’s Investor Class, for such period of time), without any adjustments. For any such period of time, the performance of the Fund’s Institutional Class would have been substantially similar to, and higher than, the performance of the Fund’s Investor Class, because the shares of both classes are invested in the same portfolio of securities, but Institutional Class shares would have had lower expenses.