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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
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
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)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination 2015-02-28
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 74% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 74.00%
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
To pursue its investment objectives, the Fund, under normal circumstances, 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 Yankee bonds.  The Fund’s investments may include foreign securities, including indirect investments such as American Depository Receipts (“ADRs”) or other types of depositary receipts, which are U.S. dollar-denominated receipts representing shares of foreign-based corporations.  The Fund may invest up to 10% of its assets in high yield bonds (commonly known as “junk bonds”).  The Fund may invest in Initial Public Offerings (“IPOs”).

The Fund is sub-advised by Financial Counselors, Inc. (“FCI”).  FCI will use its core fixed income philosophy to manage the Fund.  FCI’s core fixed income philosophy focuses on higher quality, intermediate term fixed income securities that can produce attractive results for investment with a focus on downside protection.  FCI applies a reasoned approach to fixed income management which is based on continuous analysis and assessment of the variables that influence bond prices.  FCI will use this proprietary approach that 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.  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.  As of January 31, 2014, the dollar-weighted average maturity of the Fund’s portfolio was 5.67 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, 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.

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 invests in ADRs, which are foreign securities traded on U.S. exchanges, and Yankee bonds, which are U.S. dollar denominated bonds issued by foreign companies.  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 that 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 Funds.

IPO Investments Risk:  IPO shares are subject to market risk and liquidity risk.  The market value of IPO shares will fluctuate considerably due to facts such as the absence of a prior public market, unseasoned trading, the small number of shares available for trading and limited public information about the issuer.  The purchase of IPO shares may involve high transaction costs.  When a fund’s asset base is small, a significant portion of the fund’s performance could be attributable to investments in IPOs, because such investments would have a magnified impact on 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 Funds may have to replace the security by investing the proceeds in a less attractive security.  This may reduce a 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 Fund is a successor to the FBR Core Bond Fund (the “Predecessor Core Bond 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 Core Bond Fund. The Predecessor Core Bond Fund was managed by FBR Fund Advisers, Inc. and 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”) which commenced investment operations on June 3, 1997.  On March 12, 2010, the AFBA Predecessor Bond Fund was reorganized as the FBR Core Bond Fund.  Performance figures shown below represent the Advisor Class shares of the AFBA Predecessor Bond Fund for periods prior to March 12, 2010.

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, the Barclays Capital Intermediate U.S. Government/Credit 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, the Barclays Capital Intermediate U.S. Government/Credit 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 CORE BOND 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 5.35% for the quarter ended September 30, 2009 and the lowest quarterly return was -2.84% for the quarter ended March 31, 2005.
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 Mar. 31, 2005
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.84%)
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.
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.

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.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2013)
Barclays Capital Intermediate U.S. Government/Credit Index
  
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 (0.86%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.96%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.09%
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 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.11% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.37%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.96%) [2]
Net Expenses rr_NetExpensesOverAssets 1.41%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 144
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 648
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,178
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,633
Annual Return 2004 rr_AnnualReturn2004 8.14%
Annual Return 2005 rr_AnnualReturn2005 (1.31%)
Annual Return 2006 rr_AnnualReturn2006 8.50%
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%
Label rr_AverageAnnualReturnLabel Hennessy Core Bond Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.01%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.68%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.93%
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 (5.87%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.29%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.84%
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 3.79%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.00%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.37%
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 0.80%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.87%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.11% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.78%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.62%) [2]
Net Expenses rr_NetExpensesOverAssets 1.16%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 118
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 500
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 907
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,043
Label rr_AverageAnnualReturnLabel Hennessy Core Bond Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.27%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.94%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.19%
[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.
[2] The Fund's investment manager (the "Manager") has contractually agreed to insure that total operating expenses (excluding certain expenses such as acquired fund fees and expenses and 12b-1 fees) do not exceed 1.05% of the Fund's average daily net assets of both the Investor Class and Institutional Class shares of the Fund, respectively. The Manager has agreed to maintain this expense limitation through February 28, 2015.