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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 57% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 57.00%
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 the Fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in shares of 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 market conditions, 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.  The Fund’s policy of investing at least 80% of its net assets in small-cap companies principally engaged in financial services may only be changed upon 60 days notice to shareholders.  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.  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.  The Fund focuses on financial services companies that invest in real estate, usually through mortgages and other consumer-related loans.  These companies may also offer other financial services such as discount brokerage services, insurance products, leasing services and joint venture financing. Investments may include mortgage banking companies, consumer finance companies, savings and loan associations, savings banks, building and loan associations, cooperative banks, commercial banks, other depository institutions, companies in the information technology industries which are primarily engaged in providing products and/or services to the types of companies listed above and real estate investment trusts (“REITs”).  The Fund may invest up to 20% of its net assets in companies with larger market capitalizations or companies outside of the financial services group of industries.  Investments will consist primarily of common stocks, but may include preferred stocks, warrants and convertible bonds.

When evaluating securities to purchase, the Portfolio Manager generally looks for companies that have low price-to-earnings ratios and low price-to-book ratios 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.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal market conditions, 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.
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 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, industry, 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-Sized Companies Risk: The Fund invests in small-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 that government regulation will negatively impact companies involved in the financial services group of industries.  Financial services companies can be influenced by adverse effects of volatile interest rates and other factors. The Fund may incur a loss on an investment in the securities issued by these institutions.

Non-Diversification Risk:  The Fund is non-diversified, meaning it is likely to invest in fewer stocks than a diversified fund. The Fund may be more volatile because each stock in which it invests will have greater impact on the Fund’s performance.

High Portfolio Turnover Risk:  High portfolio turnover will produce higher transaction costs (such as brokerage commissions or markups or markdowns) that the Fund must pay, and will increase realized gains (or losses) to investors, which may lower the Fund’s after-tax 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 The Fund is non-diversified, meaning it is likely to invest in fewer stocks than a diversified fund. The Fund may be more volatile because each stock in which it invests will 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 Fund is a successor to the FBR Small Cap Financial Fund (the “Predecessor Small Cap Financial Fund”) pursuant to a reorganization that took place after the close of business on October 26, 2012.  The performance information provided for the periods on or prior to October 26, 2012 is historical information for the Predecessor Small Cap Financial Fund. The Predecessor Small Cap Financial Fund was managed by FBR Fund Advisers, Inc. and had the same investment objective and substantially similar investment strategy as the Fund.

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 a broad measure of market performance, as well as an additional index that reflects the market sectors in which the Fund invests, the Russell 2000® Index and the Russell 2000® Financial Services Index.  For additional information on this index, please see “Index Descriptions” on page 66 of this Prospectus.  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 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 a broad measure of market performance, as well as an additional index that reflects the market sectors in which the Fund invests, the Russell 2000 Index and the Russell 2000 Financial Services Index.
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 TOTAL RETURN 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 22.57% for the quarter ended September 30, 2009 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 Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 22.57%
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%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged The Fund's indices have changed. Previously, the Fund used the Russell 2000 Index as its primary index and the NASDAQ Bank Index as its secondary index. The Fund will now use the Russell 2000 Financial Services Index as its primary index and the Russell 2000 Index as its secondary index. The Fund changed its primary index to the Russell 2000 Financial Services Index because it more closely reflects the types of companies held in the Fund's portfolio. The average annual total returns of the NASDAQ Bank Index for the one-year, five-year and ten-year periods ended December 31, 2013 were 41.72%, 7.54%, and 1.34%, respectively.
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 only Investor Class shares and after-tax returns for the Institutional Class shares will vary.
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 after taxes on distributions because it may include a tax benefit resulting from the capital losses that would have resulted.
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
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 only Investor Class shares and after-tax returns for the Institutional Class shares will vary. The Fund’s return after taxes on distributions and sales of Fund shares may be higher than its return before taxes and after taxes on distributions because it may include a tax benefit resulting from the capital losses that would have resulted.

The inception date of the Fund’s Institutional Class is May 30, 2008.  Performance shown prior to the inception of the 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 the Institutional Class shares.

The Fund’s indices have changed.  Previously, the Fund used the Russell 2000® Index as its primary index and the NASDAQ Bank Index as its secondary index.  The Fund will now use the Russell 2000® Financial Services Index as its primary index and the Russell 2000® Index as its secondary index.  The Fund changed its primary index to the Russell 2000® Financial Services Index because it more closely reflects the types of companies held in the Fund’s portfolio.  The average annual total returns of the NASDAQ Bank Index for the one-year, five-year and ten-year periods ended December 31, 2013 were 41.72%, 7.54%, and 1.34%, respectively.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2013)
Russell 2000® Financial Services Index
  
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 31.37%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.22%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.66%
Russell 2000® Index
  
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 38.82%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 20.08%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.07%
Investor Class
  
Risk/Return: rr_RiskReturnAbstract  
Sales charge (load) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.31%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [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 2004 rr_AnnualReturn2004 16.04%
Annual Return 2005 rr_AnnualReturn2005 (1.55%)
Annual Return 2006 rr_AnnualReturn2006 11.80%
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%
Label rr_AverageAnnualReturnLabel Hennessy Small Cap Financial Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 36.59%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.58%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.01%
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 34.52%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.11%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.67%
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 22.30%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.74%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.88%
Institutional Class
  
Risk/Return: rr_RiskReturnAbstract  
Sales charge (load) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption fee rr_RedemptionFeeOverRedemption none
Exchange fee rr_ExchangeFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.25%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.19%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 121
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 378
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 654
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,443
Label rr_AverageAnnualReturnLabel Hennessy Small Cap Financial Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 36.96%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.73%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.15%
[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.