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Hennessy Focus Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Focus Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Focus Fund seeks capital appreciation.
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’s portfolio turnover rate was 2% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 2.00%
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
Under normal circumstances, the Fund invests primarily in U.S. securities, but may also invest in foreign companies traded in the U.S. on a national securities exchange or national securities association, including American Depositary Receipts, and foreign companies traded on a foreign exchange.  Investments will consist primarily of common stocks, but may include preferred stocks, warrants, options, equity-like instruments and debt instruments.  The Portfolio Managers invest in the stocks of companies of any size without regard to market capitalization.

The Portfolio Managers implement the Fund’s strategy by focusing on companies whose valuations in the market are modest, that earn higher than average economic returns, are well managed and have ample opportunity to reinvest excess profits at above average rates.  Once a potential investment is identified, the Portfolio Managers attempt to purchase shares at a price they believe represents a discount to a conservative estimate of the company’s intrinsic value.

The Fund may from time to time hold a significant portion of its portfolio in cash or cash equivalent instruments.  If market conditions reduce the availability of securities with acceptable valuations, the Fund may, for extended periods, hold larger than usual cash reserves until securities with acceptable valuations become available.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any security, there are market and investment risks associated with your investment in the Fund. 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.

Temporary Defensive Positions Risk:  The Fund may, from time to time, take temporary defensive positions in response to adverse market, economic, political or other conditions.  To the extent the assets of the Fund are invested in temporary defensive positions, the Fund may not achieve its investment objective.  For temporary defensive purposes, the Fund may invest in cash and/or short-term obligations.

Small- and Medium-Sized Companies Risk:  The Fund invests in small- and medium-sized companies, which may have more limited liquidity and greater price volatility than larger, more established companies. Small companies may have limited product lines, markets or financial resources and their management may be dependent on a limited number of key individuals.

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.

Foreign Securities Risk:  The Fund may invest in the securities of foreign issuers listed on foreign exchanges, as well as foreign issuers listed on U.S. stock exchanges or associations through American Depositary Receipts, which are U.S. dollar-denominated securities of foreign issuers. There are specific risks associated with investing in the securities of foreign companies not typically associated with investing in domestic companies. Risks include fluctuations in the exchange rates of foreign currencies, which may affect the U.S. Dollar value of a security, and the possibility of substantial price volatility as a result of political and economic instability in the foreign country.
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 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 Russell 3000® Index, as well as an additional index that reflects the types of securities in which the Fund invests, the Russell MidCap® Growth Index.  For additional information on these indices, please see “Descriptions of Indices” on page 60 of this Prospectus.  The Fund is the successor to the FBR Focus Fund (the “Predecessor Focus Fund”). The performance information provided for the periods on or prior to October 26, 2012, is historical information for the Predecessor Focus Fund, which had the same investment objective and substantially similar investment strategy as the Fund. The Fund’s past performance (before and after taxes) is not necessarily an indication of future performance.  Prior to January 1, 2008, the Fund operated pursuant to a different investment strategy.  Performance may be higher or lower in the future.  Updated performance information is available on the Hennessy Funds’ 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 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 Russell 3000® Index, as well as an additional index that reflects the types of securities in which the Fund invests, the Russell MidCap® Growth Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the Russell MidCap® Growth 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 FOCUS FUND CALENDAR YEAR TOTAL RETURNS OF INVESTOR SHARES
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the period shown in the bar chart, the Fund’s highest quarterly return was 19.82% for the quarter ended June 30, 2009, and the lowest quarterly return was -16.38% for the quarter ended December 31, 2008.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.82%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.38%)
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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
Performance of the Fund’s Institutional Class shares will differ from that of the Fund’s Investor Class shares as the share classes have different expenses and inception dates.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
We use the Russell MidCap® Growth 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.  After-tax returns are shown for Investor Class shares only and after-tax returns for Institutional Class shares will vary.

The inception date of the Fund’s Institutional Class is May 30, 2008.  Performance shown prior to the inception of Institutional Class shares reflects the performance of the Fund’s Investor Class shares and includes expenses that are not applicable to and are higher than those of Institutional Class shares.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2016)
Hennessy Focus Fund | Russell 3000® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 3000® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.74%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.67%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.07%
Hennessy Focus Fund | Russell MidCap® Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell MidCap® Growth Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.33%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.51%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.83%
Hennessy Focus Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10%
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.32%
Other Expenses rr_OtherExpensesOverAssets 0.42%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 153
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 474
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 818
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,791
Annual Return 2007 rr_AnnualReturn2007 2.30%
Annual Return 2008 rr_AnnualReturn2008 (33.85%)
Annual Return 2009 rr_AnnualReturn2009 34.80%
Annual Return 2010 rr_AnnualReturn2010 24.55%
Annual Return 2011 rr_AnnualReturn2011 3.63%
Annual Return 2012 rr_AnnualReturn2012 16.64%
Annual Return 2013 rr_AnnualReturn2013 35.33%
Annual Return 2014 rr_AnnualReturn2014 10.20%
Annual Return 2015 rr_AnnualReturn2015 2.88%
Annual Return 2016 rr_AnnualReturn2016 7.16%
Label rr_AverageAnnualReturnLabel Hennessy Focus Fund - Investor Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.16%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.91%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.48%
Hennessy Focus Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Focus Fund - Investor Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.16%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.13%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.62%
Hennessy Focus Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Focus Fund - Investor Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.05%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.15%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.81%
Hennessy Focus Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.20%
Other Expenses rr_OtherExpensesOverAssets 0.20%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.13%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 115
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 359
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 622
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,375
Label rr_AverageAnnualReturnLabel Hennessy Focus Fund - Institutional Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 7.55%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.28%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.80%
[1] Acquired fund fees and expenses are not reflected in the Fund's financial statements, with the result that the information presented in the expense table may differ from that presented in the financial highlights.