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Ultra-Small Company Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading FUND SUMMARY: ULTRA-SMALL COMPANY FUND
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Ultra-Small Company 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 72% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 72.00%
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 invests in a diversified portfolio of common stocks of ultra-small companies. 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 20% 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 CRSP Cap-Based Portfolio 9 Index or the CRSP Cap-Based Portfolio 10 Index as defined by the Center for Research in Security Prices, LLC (“CRSP”), an affiliate of the University of Chicago. 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 $642 million. Bridgeway Capital Management, LLC (the “Adviser”) selects stocks for the Fund using a statistical approach.
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.
The Fund may invest up to 15% of its total assets in foreign securities. For purposes of the Fund’s investments, “foreign securities” means those securities issued by companies: (i) that are domiciled in a country other than the US; and (ii) that derive 50% or more of their total revenue from activities outside of the US.
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 Fund may engage in active and frequent trading of portfolio securities.
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 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 4.76%.
During the periods illustrated in this bar chart, the Fund’s highest quarterly return and lowest quarterly return were:
      Quarter      Total
Return		  
Highest Return:
      Q2 20        39.98%  
Lowest Return:
      Q1 20        -35.06%  
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 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 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 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 Fund | High Portfolio Turnover Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
High Portfolio Turnover Risk—A higher portfolio turnover rate increases transaction costs and as a result may adversely impact the Fund’s performance and may increase share price volatility. Moreover, a higher portfolio turnover rate may result in higher taxes when Fund shares are held in a taxable account.
Ultra-Small Company 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 Fund | Foreign Securities Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Foreign Securities Risk—Investments in foreign securities can be more volatile than investments in US securities. Foreign securities can be adversely affected by political, economic and market developments abroad that may not necessarily affect the US economy or companies located in the United States.
Ultra-Small Company 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 Fund | Ultra Small Company Risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
Ultra-Small Company Risk—The market prices of ultra-small company shares typically exhibit greater volatility than small-company shares, 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 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 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 rr_RedemptionFeeOverRedemption none
Exchange Fees rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.34% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.24% [1]
1 Year rr_ExpenseExampleYear01 $ 126
3 Years rr_ExpenseExampleYear03 393
5 Years rr_ExpenseExampleYear05 680
10 Years rr_ExpenseExampleYear10 $ 1,500
2014 rr_AnnualReturn2014 (0.56%)
2015 rr_AnnualReturn2015 (16.12%)
2016 rr_AnnualReturn2016 14.06%
2017 rr_AnnualReturn2017 3.88%
2018 rr_AnnualReturn2018 (15.68%)
2019 rr_AnnualReturn2019 9.51%
2020 rr_AnnualReturn2020 31.31%
2021 rr_AnnualReturn2021 33.34%
2022 rr_AnnualReturn2022 (10.72%)
2023 rr_AnnualReturn2023 17.94%
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 4.76%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Return:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 39.98%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Return:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (35.06%)
1 Year rr_AverageAnnualReturnYear01 17.94%
5 Years rr_AverageAnnualReturnYear05 15.09%
10 Years rr_AverageAnnualReturnYear10 5.34%
Ultra-Small Company Fund | Return After Taxes on Distributions | Class N  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.50% [2]
5 Years rr_AverageAnnualReturnYear05 12.43% [2]
10 Years rr_AverageAnnualReturnYear10 3.14% [2]
Ultra-Small Company Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class N  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.50% [2]
5 Years rr_AverageAnnualReturnYear05 11.58% [2]
10 Years rr_AverageAnnualReturnYear10 3.64% [2]
Ultra-Small Company Fund | Russell 3000 Index (reflects no deductions for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 25.96% [3]
5 Years rr_AverageAnnualReturnYear05 15.16% [3]
10 Years rr_AverageAnnualReturnYear10 11.48% [3]
Ultra-Small Company 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] 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.
[3] 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.