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Hennessy Small Cap Financial Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Small Cap Financial Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Small Cap Financial 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 46% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 46.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Includes acquired fund fees and expenses that do not exceed 0.01% of the Fund’s average daily net assets. 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.
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 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 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 at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of small-cap companies “principally engaged” in the business of providing financial services to consumers and industry.  An issuer is “principally engaged” in the business of providing financial services if at least 50% of its assets, gross income, or net profits are committed to, or derived from, financial services activities.  Financial services activities are activities primarily related to consumer and commercial banking, insurance, securities and investments, specialty finance and real estate. Investments may include mortgage banking companies, discount brokerage companies, insurance companies, consumer finance companies, savings and loan associations, savings banks, leasing companies, building and loan associations, cooperative banks, commercial banks, investment companies, other depository institutions, companies in the information technology industries that are primarily engaged in providing products and/or services to the types of companies listed above and real estate investment trusts.  The Fund considers a small-cap company to be one that has a market capitalization of less than $3 billion, measured at the time of purchase.  The Fund’s investments will consist primarily of common stocks, but may include preferred stocks, warrants and convertible bonds.

When evaluating securities to purchase, the Portfolio Managers generally look for companies that have a low price-to-earnings ratio and low price-to-book ratio relative to the financial services group of industries.

The Fund will not invest more than 5% of its total assets in the equity-related securities of any one company that derives more than 15% of its revenues from brokerage or investment management activities.
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.

Real Estate-Related Risk:  Because the Fund focuses on financial services companies that may invest in real estate, the Fund is subject to the risks associated with ownership of real estate and with the real estate industry in general.  Real estate values (and the values of real estate-related securities) fluctuate with changes in general and local economic conditions and are particularly sensitive to economic downturns.  Real estate values are also affected by changes in interest rates and governmental actions such as tax and zoning changes.

Industry Concentration Risk:  The Fund concentrates its investments within the financial services group of industries.  Because of its narrow industry focus, the performance of the Fund is tied closely to and affected by developments in the financial services group of industries, such as the possibility of adverse government regulation.  Financial services companies can be influenced by adverse effects of movements in interest rates and other factors.

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.
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 2000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell 2000® Financial Services 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 Small Cap Financial Fund (the “Predecessor Small Cap Financial Fund”).  The performance information provided for the periods on or prior to October 26, 2012, is historical information for the Predecessor Small Cap Financial 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.  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 2000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell 2000® Financial Services Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the Russell 2000® Financial Services Index as an additional index because it compares the Fund’s performance with the return 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 SMALL CAP FINANCIAL 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 25.41% for the quarter ended December 31, 2016, and the lowest quarterly return was -21.72% for the quarter ended September 30, 2011.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 25.41%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.72%)
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 and only 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 2000® Financial Services Index as an additional index because it compares the Fund’s performance with the return 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 and only 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 Small Cap Financial Fund | Russell 2000® Financial Services Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 2000® Financial Services Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 31.14%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 18.01%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.28%
Hennessy Small Cap Financial Fund | Russell 2000® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 2000® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.31%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.46%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.07%
Hennessy Small Cap Financial 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 0.40% [1]
Other Expenses rr_OtherExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.55%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 158
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 490
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 845
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,845
Annual Return 2007 rr_AnnualReturn2007 (22.18%)
Annual Return 2008 rr_AnnualReturn2008 (8.73%)
Annual Return 2009 rr_AnnualReturn2009 20.13%
Annual Return 2010 rr_AnnualReturn2010 17.50%
Annual Return 2011 rr_AnnualReturn2011 (15.63%)
Annual Return 2012 rr_AnnualReturn2012 21.42%
Annual Return 2013 rr_AnnualReturn2013 36.59%
Annual Return 2014 rr_AnnualReturn2014 (3.40%)
Annual Return 2015 rr_AnnualReturn2015 11.74%
Annual Return 2016 rr_AnnualReturn2016 33.41%
Label rr_AverageAnnualReturnLabel Hennessy Small Cap Financial Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 33.41%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 19.02%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.28%
Hennessy Small Cap Financial Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Small Cap Financial Fund - Investor Returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 29.73%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 16.80%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.71%
Hennessy Small Cap Financial Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Small Cap Financial Fund - Investor Returns after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 21.69%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.08%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.56%
Hennessy Small Cap Financial 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 0.28% [1]
Other Expenses rr_OtherExpensesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.18%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 120
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 375
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 649
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,432
Label rr_AverageAnnualReturnLabel Hennessy Small Cap Financial Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 33.92%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 19.41%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.55%
[1] Includes acquired fund fees and expenses that do not exceed 0.01% of the Fund's average daily net assets. 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.