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Hennessy Core Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Core Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Core Bond Fund seeks current income with capital growth as a secondary objective.
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 50 % of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 50.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent For Investor Class shares, effective March 1, 2015, the Distribution and Service (12b-1) Fees were reduced from 0.25% to 0.15% and Shareholder Servicing Fees of 0.10% were implemented. The expense table has been restated to reflect that such rates will be in effect for the entire 2016 fiscal year.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees 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 in fixed income securities, which include domestic investment grade corporate, agency and governmental bonds, mortgage-backed securities, asset-backed securities, and U.S. denominated bonds issued by foreign companies.  The Fund’s investments may include foreign securities, including indirect investments such as American Depository Receipts or other types of depositary receipts, which are U.S. dollar-denominated securities of foreign issuers traded in the U.S.  The Fund may invest up to 10% of its assets in high - yield bonds (commonly known as “junk bonds”).  The Fund may invest directly in fixed income securities or it may invest indirectly in fixed income securities by investing in other investment companies (including exchange-traded funds, referred to as ETFs) that invest in fixed income securities.

The Portfolio Managers focus on higher quality, intermediate term fixed income securities that can produce attractive results for investment with a focus on downside protection.  They employ continuous analysis and assessment of the variables that influence bond prices.  The Portfolio Managers will use this proprietary approach, which combines economic momentum, inflationary expectations and technical factors, to evaluate interest rate changes in order to manage the duration of the portfolio in an effort to mitigate risk and maximize total return.

As of January 31, 2016 , the dollar-weighted average maturity of the Fund’s portfolio was 5.77 years based on stated maturity.
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, an industry, a sector of the economy or the market as a whole.

Debt Investments Risk:  The yields and principal values of debt securities will also fluctuate. Generally, values of debt securities change inversely with interest rates.  That is, as interest rates go up, the values of debt securities tend to go down and vice versa.  Furthermore, these fluctuations tend to increase as a bond’s maturity increases such that a longer - term bond will increase or decrease more for a given change in interest rates than a shorter - term bond.

Foreign Securities Risk:  The Fund may invest in the securities of foreign issuers, including American Depositary Receipts, which are U.S. dollar-denominated securities of foreign issuers traded in the U.S., and Yankee bonds, which are U.S. dollar-denominated bonds 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.

High - Yield Investments Risk:  The Fund may invest a portion of its assets in lower-rated, high-yielding bonds (commonly known as “junk bonds”).  These bonds have a greater degree of default risk than higher-rated bonds.  Default risk is the possibility that the issuer of a debt security will fail to make timely payments of principal or interest to the Fund.

Mortgage-Backed and Asset-Backed Securities Investments Risk:  Mortgage- and asset-backed securities are subject to prepayment risk, which is the risk that the borrower will prepay some or all of the principal owed to the issuer.  If prepayment occurs, the Fund may have to replace the security by investing the proceeds in a less attractive security.  This may reduce the Fund’s share price and income distribution.

Investment Company Securities Risk:  When the Fund invests in another investment company (including ETFs), it will indirectly bear its proportionate share of any fees and expenses payable directly by the other investment company. Therefore, the Fund will incur higher expenses, many of which may be duplicative. In addition, the Fund may be affected by losses of the underlying funds and the level of risk arising from the investment practices of the underlying funds (such as the use of leverage by the funds). The Fund has no control over the risks taken by the underlying funds in which it invests.

ETF Risk:  In addition to risks generally associated with investments in investment company securities, ETFs are subject to the following risks that do not apply to non-exchange traded funds: (i) an ETF’s shares may trade at a market price that is above or below their net asset value; (ii) an active trading market for an ETF’s shares may not develop or be maintained; (iii) the ETF may employ an investment strategy that utilizes high leverage ratios; or (iv) trading of an ETF’s shares may be halted if the listing exchange’s officials deem such action appropriate, the shares are de-listed from the exchange, or the activation of market-wide “circuit breakers” (which are tied to large decreases in stock prices) halts stock trading generally.

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.
Risk Lose Money [Text] rr_RiskLoseMoney The value of your investment will fluctuate over time and it is possible to lose money.
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 Barclays Capital Intermediate U.S. Government/Credit Index.  For additional information on this index, please see “Descriptions of Indices ” on page 66 of this Prospectus.  The Fund is the successor to the FBR Core Bond Fund (the “Predecessor Core Bond Fund”).  The performance information provided for the periods on or prior to October 26, 2012 is historical information for the Predecessor Core Bond Fund, which had the same investment objective and substantially similar investment strategy as the Fund.  The Predecessor Core Bond Fund was the investment successor to the AFBA 5Star Total Return Bond Fund (the “AFBA Predecessor Bond Fund”). The performance information provided for periods prior to March 12, 2010 is historical information for the Advisor Class shares of the AFBA Predecessor Bond 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 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 Barclays Capital Intermediate U.S. Government/Credit Index.
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 CORE BOND 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 5.35% for the quarter ended September 30, 2009 and the lowest quarterly return was -2.39% for the quarter ended June 30, 2013 .
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 5.35%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.39%)
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 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 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.
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 Investor Class shares only and after-tax returns for 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 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 Core Bond Fund | Barclays Capital Intermediate U.S. Government/Credit Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Barclays Capital Intermediate U.S. Government/Credit Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.07%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.58%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.04%
Hennessy Core Bond Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15% [1]
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10% [1]
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 2.11%
Other Expenses rr_OtherExpensesOverAssets 2.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.20%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 323
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 986
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,674
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,503
Annual Return 2006 rr_AnnualReturn2006 8.51%
Annual Return 2007 rr_AnnualReturn2007 5.49%
Annual Return 2008 rr_AnnualReturn2008 0.50%
Annual Return 2009 rr_AnnualReturn2009 9.50%
Annual Return 2010 rr_AnnualReturn2010 7.06%
Annual Return 2011 rr_AnnualReturn2011 4.87%
Annual Return 2012 rr_AnnualReturn2012 7.23%
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 1.75%
Annual Return 2015 rr_AnnualReturn2015 (1.56%)
Label rr_AverageAnnualReturnLabel Hennessy Core Bond Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.56%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.41%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.27%
Hennessy Core Bond Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Core Bond Fund - Investor Returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.02%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.33%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.30%
Hennessy Core Bond Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Core Bond Fund - Investor Returns after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.68%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.51%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.91%
Hennessy Core Bond Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Shareholder Servicing rr_Component1OtherExpensesOverAssets none [1]
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 1.99%
Other Expenses rr_OtherExpensesOverAssets 1.99%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.83%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 286
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 877
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,494
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,157
Label rr_AverageAnnualReturnLabel Hennessy Core Bond Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.15%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.55%
[1] For Investor Class shares, effective March 1, 2015, the Distribution and Service (12b-1) Fees were reduced from 0.25% to 0.15% and Shareholder Servicing Fees of 0.10% were implemented. The expense table has been restated to reflect that such rates will be in effect for the entire 2016 fiscal year.
[2] 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.