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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 27 % of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 27.00%
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 ten 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 ten “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 will borrow money by entering into reverse repurchase agreements secured by its portfolio of U.S. Treasury securities.

On numerous dates throughout the year, the Manager will determine the ten 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 will then purchase those stocks in approximately equal dollar amounts until the next determination of the ten highest yielding DJIA stocks. The Fund also purchases from time to time an approximately equal amount of U.S. Treasury securities having a remaining maturity of less than one year.

The Fund generally holds its stock investments for one year, including stocks that are no longer one of the Dogs of the Dow stocks, stocks that are no longer in the DJIA and stocks received in reorganizations of companies in the DJIA. At the end of the one-year period, the Fund sells any stocks that are no longer one of the Dogs of the Dow stocks and replaces them with stocks that are Dogs of the Dow stocks. Additionally, it may sell a portion of the stocks that remain in the portfolio so that the rebalanced portion of the portfolio adheres to the Fund’s asset allocation strategy.

*
The Dow Jones Industrial Average is the property of the Dow Jones & Company, Inc. Dow Jones & Company, Inc. is not affiliated with the Hennessy Funds or its investment advisor. Dow Jones & Company, Inc. has not participated in any way in the creation of the Hennessy Funds or in the selection of stocks included in the Hennessy Funds and has not approved any information included in the Prospectus.
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 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, despite 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 for a given year are experiencing financial difficulty, or are out of favor in the market because of weak performance, a poor earnings forecast, negative publicity or general market cycles. The Fund’s portfolio is rebalanced annually in accordance with its strategy, which may result in the elimination of better performing assets from the Fund’s investments and increases in investments with relatively lower total return.

Non-Diversification Risk: Because the Fund is non-diversified (meaning that compared to diversified mutual funds, the Fund may invest a greater percentage of its assets in a more limited number of issuers), the Fund’s shares may be more susceptible to adverse changes in the value of a particular security than would be the shares of a diversified mutual fund. Thus, the Fund may be more volatile because each stock in which it invests could have greater impact on the Fund’s performance.

Borrowing Risk: The Fund borrows against its investments. Purchasing Treasury/Government 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 not. Also, the Fund will incur interest costs when it borrows money, which 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 or 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 Because the Fund is non-diversified (meaning that compared to diversified mutual funds, the Fund may invest a greater percentage of its assets in a more limited number of issuers), the Fund’s shares may be more susceptible to adverse changes in the value of a particular security than would be the shares of a diversified mutual fund. Thus, the Fund may be more volatile because each stock in which it invests could have greater impact on the Fund’s performance.
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 1, 5 and 10 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 BofA Merrill Lynch 90-day Treasury Bill Index). For additional information on these indices, please see “Descriptions of Indices ” on page 66 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 on the Fund’s website (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 1, 5 and 10 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 BofA Merrill Lynch 90-day 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 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 -18.41% for the quarter ended December 31, 2008.
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 Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.41%)
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 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 Actual after-tax returns depend on an 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 sales of Fund shares may be higher than its return before taxes and return after taxes on distributions because it may include a tax benefit resulting from the capital losses that would have resulted.
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 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, 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 sales of Fund shares may be higher than its return before taxes and return after taxes on distributions because it may include a tax benefit resulting from the capital losses that would have resulted.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2015)
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 0.33%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.52%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.29%
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 0.21%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.30%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.75%
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 0.12%
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.31%
Other Expenses rr_OtherExpensesOverAssets 0.53%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.28%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 130
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 406
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 702
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,545
Annual Return 2006 rr_AnnualReturn2006 21.83%
Annual Return 2007 rr_AnnualReturn2007 2.03%
Annual Return 2008 rr_AnnualReturn2008 (31.76%)
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%
Label rr_AverageAnnualReturnLabel Hennessy Total Return Fund Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.00%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.43%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.42%
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 (1.46%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 7.33%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.70%
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 2.54%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 6.67%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.36%