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Label Element Value
Hennessy Total Return Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Total Return Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Total Return Fund seeks total return, consisting of capital appreciation and current income.
Expense [Heading] rr_ExpenseHeading Fund Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This 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 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 had a portfolio turnover rate of 10% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 10.00%
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 shares of this 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 you reinvest all dividends and distributions, 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 the assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategy
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests in the 10 highest dividend-yielding Dow Jones Industrial Average (“DJIA”) stocks (known as the “Dogs of the Dow”) and in U.S. Treasury securities with a maturity of less than one year.

The Fund invests approximately 50% of its assets in the 10 Dogs of the Dow stocks in roughly equal dollar amounts and approximately 50% of its assets in U.S. Treasury securities with a maturity of less than one year. The Fund then utilizes a borrowing strategy that allows the Fund’s performance to approximate what it would be if the Fund had an asset allocation of roughly 75% Dogs of the Dow stocks and 25% U.S. Treasury securities. The Fund typically borrows money by entering into reverse repurchase agreements secured by its portfolio of U.S. Treasury securities.

The total portfolio is divided into multiple sub-portfolios, each of which uses the Dogs of the Dow strategy. On various dates throughout the year, each of these sub-portfolios is reviewed. In a review, the Investment Manager determines the 10 highest yielding common stocks in the DJIA by annualizing the last quarterly or semi-annual ordinary dividend declared on each stock and dividing the result by the market value of that stock. The Fund then purchases those stocks in approximately equal amounts for the sub-portfolio being reviewed. From time to time, the Fund also may purchase an approximately equal amount of U.S. Treasury securities having a remaining maturity of less than one year for the sub-portfolio being reviewed. On the next date, another sub-portfolio is reviewed in a similar manner.

Regardless of whether they remain in the DJIA or retain the characteristics of Dogs of the Dow Stocks, the Fund generally holds the stock investments within each sub-portfolio for one year, at which time the applicable sub-portfolio is up for another review.  At the end of the one-year period, the Fund sells any stocks in the applicable sub-portfolio that are no longer Dogs of the Dow stocks and replaces them with stocks that are Dogs of the Dow stocks. Additionally, the Fund may sell a portion of the stocks that remain in the applicable sub-portfolio so that the rebalanced portion of the sub-portfolio adheres to the Fund’s asset allocation strategy.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Although a portion of the Fund’s portfolio is invested in U.S. Treasury securities, there are market and investment risks associated with an investment in the Fund, as there are with any security. The value of your investment will fluctuate over time, and it is possible to lose money. The principal risks of investing in the Fund include the following:

Market and Equity Investments Risk: The market value of a security may move up or down, and these fluctuations may cause a security to be worth more or less than the price originally paid for it. Market risk may affect a single company, an industry, a sector of the economy, or the market as a whole. The value of equity securities will fluctuate due to many factors, including the past and predicted earnings of the issuer, the quality of the issuer’s management, general market conditions, forecasts for the issuer’s industry, and the value of the issuer’s assets.

Formula Investing Risk: The Fund will adhere to its strategy during the course of the year, subject to applicable Securities and Exchange Commission requirements and federal tax requirements relating to mutual funds, regardless of any adverse developments that may arise. This could result in substantial losses to the Fund if, for example, the stocks selected for the Fund’s portfolio in a given year are experiencing financial difficulty or are out of favor with investors.

Non-Diversification Risk: The Fund is non-diversified under the Investment Company Act. Accordingly, the Fund typically invests a greater portion of its assets in, and its performance may be affected by, a smaller number of issuers than if it were a diversified fund. Further, the Fund may experience greater losses as a result of a single issuer’s unfavorable market or economic conditions or other adverse developments impacting the market value of the issuer’s securities.

Borrowing Risk: The Fund borrows against its investments by entering into reverse repurchase agreements secured by its portfolio of U.S. Treasury securities. Purchasing U.S. Treasury securities with borrowed money is an investment technique that increases investment risk because if the securities purchased with borrowed money decline in value, the Fund’s losses would be greater than if it had used cash to make purchases. Also, the Fund incurs interest costs when it borrows money, and these costs may exceed the investment returns it earns on the securities purchased with borrowed money. Reverse repurchase agreements involve the risk that the buyer of the securities sold by the Fund might be unable to deliver them when the Fund seeks to repurchase.  If the buyer of securities under a reverse repurchase agreement files for bankruptcy or becomes insolvent, the buyer, trustee, or receiver may receive an extension of time to determine whether to enforce the Fund’s obligation to repurchase the securities, and the Fund’s use of the proceeds from the reverse repurchase agreement may effectively be restricted pending such decision.
Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment will fluctuate over time, and it is possible to lose money.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is non-diversified under the Investment Company Act. Accordingly, the Fund typically invests a greater portion of its assets in, and its performance may be affected by, a smaller number of issuers than if it were a diversified fund. Further, the Fund may experience greater losses as a result of a single issuer’s unfavorable market or economic conditions or other adverse developments impacting the market value of the issuer’s securities.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the Hennessy Total Return Fund by showing changes in its performance from year to year and how the Fund’s average annual returns for one, five, and ten years compare with those of an index that reflects a broad measure of market performance, the DJIA, as well as an additional index that reflects the types of securities in which the Fund invests, the 75/25 Blended DJIA/Treasury Index (which consists of 75% common stocks represented by the DJIA and 25% short-duration Treasury securities represented by the ICE BofAML U.S. 3-Month Treasury Bill Index). For additional information on these indices, please see “Descriptions of Indices” on page 69 of this Prospectus. The Fund is the successor to the Hennessy Total Return Fund, a series of The Hennessy Funds, Inc. (the “Predecessor Total Return Fund”). The performance information provided for the periods on or prior to February 28, 2014, is historical information for the Predecessor Total Return Fund, which was managed by the same investment adviser and had the same investment objective and investment strategy as the Fund. 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 at www.hennessyfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the Hennessy Total Return Fund by showing changes in its performance from year to year and how the Fund’s average annual returns for one, five, and ten years compare with those of an index that reflects a broad measure of market performance, the DJIA, as well as an additional index that reflects the types of securities in which the Fund invests, the 75/25 Blended DJIA/Treasury Index (which consists of 75% common stocks represented by the DJIA and 25% short-duration Treasury securities represented by the ICE BofAML U.S. 3-Month Treasury Bill Index).
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the 75/25 Blended DJIA/Treasury Index as an additional index because it compares the Fund’s performance with the returns of an index reflecting the performance of investments similar to those of the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.hennessyfunds.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 future performance.
Bar Chart [Heading] rr_BarChartHeading HENNESSY TOTAL RETURN FUND CALENDAR YEAR TOTAL RETURNS
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the period shown on the bar chart, the Fund’s highest quarterly return was 15.11% for the quarter ended September 30, 2009, and the lowest quarterly return was -13.44% for the quarter ended March 31, 2009.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.11%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.44%)
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 The after-tax returns are calculated using the highest historical individual stated 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 individual investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts.
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 its “returns before taxes” or “returns after taxes on distributions” because it may include a tax benefit due to the capital losses generated by the sale of Fund shares.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
We use the 75/25 Blended DJIA/Treasury Index as an additional index because it compares the Fund’s performance with the returns of an index reflecting the performance of investments similar to those of the Fund.

The after-tax returns are calculated using the highest historical individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an individual investor’s tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their Fund shares through tax deferred arrangements, such as 401(k) plans or individual retirement accounts.  The Fund’s “return after taxes on distributions and sale of Fund shares” may be higher than its “returns before taxes” or “returns after taxes on distributions” because it may include a tax benefit due to the capital losses generated by the sale of Fund shares.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2018)
Hennessy Total Return Fund | 75/25 Blended DJIA/Treasury Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel 75/25 Blended DJIA/Treasury Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.97%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.49%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.01%
Hennessy Total Return Fund | Dow Jones Industrial Average (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Dow Jones Industrial Average (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.48%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 9.70%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.16%
Hennessy Total Return Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.60%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10%
Interest Expense rr_Component2OtherExpensesOverAssets 0.76%
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.34%
Other Expenses rr_OtherExpensesOverAssets 1.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 199
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 615
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,057
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,285
Annual Return 2009 rr_AnnualReturn2009 16.92%
Annual Return 2010 rr_AnnualReturn2010 14.09%
Annual Return 2011 rr_AnnualReturn2011 10.81%
Annual Return 2012 rr_AnnualReturn2012 6.77%
Annual Return 2013 rr_AnnualReturn2013 18.52%
Annual Return 2014 rr_AnnualReturn2014 5.85%
Annual Return 2015 rr_AnnualReturn2015 1.00%
Annual Return 2016 rr_AnnualReturn2016 12.92%
Annual Return 2017 rr_AnnualReturn2017 11.17%
Annual Return 2018 rr_AnnualReturn2018 0.11%
Label rr_AverageAnnualReturnLabel Hennessy Total Return Fund Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.11%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.08%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.65%
Hennessy Total Return Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Total Return Fund Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.00%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.04%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.45%
Hennessy Total Return Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Total Return Fund Return after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.88%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.57%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.84%
[1] Acquired fund fees and expenses are not reflected in the Fund's financial statements, so the information presented in the expense table may differ from that presented in the financial highlights.