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Ultra-Small Company Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY: ULTRA-SMALL COMPANY MARKET FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Ultra-Small Company Market Fund (the “Fund”) seeks to provide a long-term total return on capital, primarily through capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (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 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 44% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expense Information has been restated to reflect current fees.
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. 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 aims to achieve its objective by approximating the total return of the CRSP Cap-Based Portfolio 10 Index (the “Index”) published by the Center for Research in Security Prices, LLC (“CRSP”), an affiliate of the University of Chicago over longer time periods. Under normal circumstances, the Fund invests at least 80% of its net assets (plus borrowings for investment purposes) in ultra-small company stocks based on company size at the time of purchase. For purposes of the Fund’s investments, “ultra-small companies” are defined as those: (i) companies that have a market capitalization the size of the smallest 10% of companies listed on the New York Stock Exchange; or (ii) companies with a capitalization that falls within the range of capitalization of companies included in the Index as defined by CRSP. A majority of the stocks in the Fund are listed on Nasdaq. On June 30, 2024, the stocks in this group generally had a market capitalization of less than $279 million. Bridgeway Capital Management, LLC (the “Adviser”) invests in a representative sample of the companies included in the Index using a statistical approach. However, the Adviser also may invest in companies that are not included in the Index.
The Adviser’s investment process incorporates material environmental, social, and governance (“ESG”) information, when available, as a consideration in the ongoing assessment of potential portfolio securities. The Adviser uses ESG research and/or ratings information provided by third parties in performing this analysis and considering ESG risks. As with any consideration used in assessing portfolio securities, the Adviser may, at times, utilize ESG information to increase the weighting of an issuer with a good ESG record or decrease the weighting of an issuer with a poor ESG record. However, as ESG information is just one investment consideration, ESG considerations are not solely determinative in any investment decision made by the Adviser. ESG information for ultra-small companies may be limited, although the Adviser’s investment process incorporates this information when available.
Although the Fund seeks investments across a number of sectors, from time to time, based on portfolio positioning to reflect its benchmark, the Fund may have significant positions in particular sectors.
The Adviser also seeks to minimize the distribution of capital gains, within the constraints of the investment objective and ultra-small company focus, by offsetting capital gains with capital losses. By paying close attention to trading, the Adviser seeks to conduct such tax management without detriment to the overall Fund return.
The Fund may purchase stock market index futures in order to equitize cash.
Risk [Heading] rr_RiskHeading Principal Risks:
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and table below provide an indication of the risk of investing in the Fund. The bar chart shows how the Fund’s performance has varied on a calendar year basis. The table shows how the Fund’s average annual returns for various periods compare with those of a broad measure of market performance. This information is based on past performance. Past performance (before and after taxes) does not guarantee future results. Updated performance information is available on the Fund’s website at bridgewayfunds.com or by calling 800-661-3550.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table below provide an indication of the risk of investing in the Fund. The bar chart shows how the Fund’s performance has varied on a calendar year basis. The table shows how the Fund’s average annual returns for various periods compare with those of a broad measure of market performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex Effective July 24, 2024, the Fund added a new broad-based index, the Russell 3000 Index, due to regulatory requirements. The Fund retained the Russell Microcap Index as a second benchmark because the Russell Microcap Index is more closely aligned with the Fund’s investment strategies and investment restrictions.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 800-661-3550
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress bridgewayfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) does not guarantee future results.
Bar Chart [Heading] rr_BarChartHeading Ultra-Small Company Market Fund Year by Year % Returns as of 12/31 of Each Year
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Return from 1/1/24 through 9/30/24 was 3.80%.
During the periods illustrated in this bar chart, the Fund’s highest quarterly return and lowest quarterly return were:
      Quarter     
Total
Return
  
Highest Return:
      Q4 20        37.09%  
Lowest Return:
      Q1 20        -36.23%  
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (For the periods ended 12/31/23)
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 After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement plans.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a potential tax benefit of realizing a capital loss upon the sale of Fund shares.
Ultra-Small Company Market Fund | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Therefore, shareholders of this Fund are exposed to higher risk and could lose money.
Ultra-Small Company Market Fund | Market Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Market Risk—The Fund is also subject to the risk that ultra-small company stocks will underperform other kinds of investments for a period of time. This may be due to numerous factors, including interest rates, the outlook for corporate profits, the health of the national and world economies, national and world social and political events, and the fluctuation of other stock markets around the world. These risks may be magnified if certain social, political, economic and other conditions and events (such as natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest) adversely interrupt the global economy.
Ultra-Small Company Market Fund | Sector Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Sector Risk—Companies with similar characteristics may be grouped together in broad categories called sectors. A certain sector may underperform other sectors or the market as a whole. As the Adviser allocates more of the Fund’s portfolio holdings to a particular sector, the Fund’s performance will be more susceptible to any economic, business or other developments which generally affect that sector.
Ultra-Small Company Market Fund | Management and Operational Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Management and Operational Risk—The Adviser uses statistical analyses and models to select investments for the Fund. Any imperfections, errors, or limitations in the models or analyses and therefore any decisions made in reliance on such models or analyses could expose the Fund to potential risks. In addition, the models used by the Adviser assume that certain historical statistical relationships will continue. These models are constructed based on historical data supplied by third parties and, as a result, the success of relying on such models may depend heavily on the accuracy and reliability of the supplied historical data.
Ultra-Small Company Market Fund | Environmental Social and Governance Investing Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Environmental, Social, and Governance Investing Risk—The Fund’s incorporation of ESG considerations in its investment strategy may cause it to make different investments than a fund that has a similar investment style but does not incorporate such considerations in its strategy. As with the use of any considerations involved in investment decisions, there is no guarantee that the ESG investment considerations used by the Fund will result in the selection of issuers that will outperform other issuers or help reduce risk in the Fund. The Fund may underperform funds that do not incorporate these considerations.
Ultra-Small Company Market Fund | Ultra Small Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Ultra-Small Company Risk—The market price of ultra-small company shares typically exhibits greater volatility than small-company and even micro-cap company shares and much greater volatility than large-company shares. Therefore, shareholders of this Fund are exposed to higher risk and could lose money.
Ultra-Small Company Market Fund | Derivatives Risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Derivatives Risk—The Fund’s use of futures to equitize cash may increase the volatility of the Fund and, if the transaction is not successful, could result in a loss to the Fund. The use of futures could produce disproportionate gains or losses, more than the principal amount invested. Investing in futures involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments and, in a down market, could become harder to value or sell at a fair price.
Ultra-Small Company Market Fund | Capital Gains Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Capital Gains Risk—If too many ultra-small companies in the Fund outgrow the Fund’s ultra-small-cap mandate or if the Fund experiences extensive redemptions, the Adviser might need to sell some stocks, which could create capital gains. There can be no guarantee that the Fund will not distribute substantial capital gains, although the Adviser seeks to avoid doing so.
Ultra-Small Company Market Fund | Class N  
Risk/Return: rr_RiskReturnAbstract  
Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Sales Charge (Load) Imposed on Reinvested Dividends rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther none
Redemption Fees (as a percentage of amount redeemed for shares held less than six months) rr_RedemptionFeeOverRedemption 2.00%
Exchange Fees rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.30% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80% [1]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [2]
Total Annual Fund Operating Expenses (After Fee Waiver/Expense Reimbursement) rr_NetExpensesOverAssets 0.75%
1 Year rr_ExpenseExampleYear01 $ 77
3 Years rr_ExpenseExampleYear03 240
5 Years rr_ExpenseExampleYear05 417
10 Years rr_ExpenseExampleYear10 $ 930
2014 rr_AnnualReturn2014 4.61%
2015 rr_AnnualReturn2015 (8.28%)
2016 rr_AnnualReturn2016 21.47%
2017 rr_AnnualReturn2017 12.47%
2018 rr_AnnualReturn2018 (17.12%)
2019 rr_AnnualReturn2019 15.34%
2020 rr_AnnualReturn2020 25.53%
2021 rr_AnnualReturn2021 22.31%
2022 rr_AnnualReturn2022 (23.40%)
2023 rr_AnnualReturn2023 11.42%
Year to Date Return, Label rr_YearToDateReturnLabel Return from 1/1/24 through 9/30/24
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2024
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.80%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 37.09%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (36.23%)
1 Year rr_AverageAnnualReturnYear01 11.42%
5 Years rr_AverageAnnualReturnYear05 8.61%
10 Years rr_AverageAnnualReturnYear10 5.08%
Ultra-Small Company Market Fund | Return After Taxes on Distributions | Class N  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.17% [3]
5 Years rr_AverageAnnualReturnYear05 7.10% [3]
10 Years rr_AverageAnnualReturnYear10 2.93% [3]
Ultra-Small Company Market Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class N  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.92% [3]
5 Years rr_AverageAnnualReturnYear05 6.87% [3]
10 Years rr_AverageAnnualReturnYear10 3.70% [3]
Ultra-Small Company Market Fund | Russell 3000 Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.96% [4]
5 Years rr_AverageAnnualReturnYear05 15.16% [4]
10 Years rr_AverageAnnualReturnYear10 11.48% [4]
Ultra-Small Company Market Fund | Russell Microcap Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 9.33%
5 Years rr_AverageAnnualReturnYear05 8.56%
10 Years rr_AverageAnnualReturnYear10 5.79%
[1] Expense Information has been restated to reflect current fees.
[2] Bridgeway Capital Management, LLC (the “Adviser”), the investment adviser to the Fund pursuant to its Management Agreement with Bridgeway Funds, is contractually obligated to waive fees and/or pay Fund expenses, if necessary, to ensure that net expenses do not exceed 0.75%. The expense limitation cannot be changed or eliminated without shareholder approval.
[3] 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. Return After Taxes on Distributions and Sale of Fund Shares may be higher than other returns for the same period due to a potential tax benefit of realizing a capital loss upon the sale of Fund shares. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement plans.
[4] Effective July 24, 2024, the Fund added a new broad-based index, the Russell 3000 Index, due to regulatory requirements. The Fund retained the Russell Microcap Index as a second benchmark because the Russell Microcap Index is more closely aligned with the Fund’s investment strategies and investment restrictions.