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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Technology Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Technology Fund seeks long-term 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)
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 164% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 164.00%
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 companies that are principally engaged in the research, design, development, manufacturing or distributing products or services in the technology industry.  The Fund’s policy of investing at least 80% of its net assets in companies principally engaged in technology may only be changed upon 60 days notice to shareholders.  The Fund will primarily invest in equity securities (which include common stocks, preferred stocks, warrants and other securities convertible into common stocks, including convertible bonds and convertible preferred stock) of companies listed on a U.S. securities exchange or NASDAQ that are expected to experience earnings growth as a result of technology.  Potential investments would include, but not be limited to, the following industries:  computer software and hardware, semiconductors, scientific instru- mentation, telecommunications, pharmaceuticals, chemicals, synthetic materials, defense and commercial electronics, data storage and retrieval, biotechnology, and healthcare and medical supplies.  While the Fund’s investments will primarily be in domestic U.S. securities, the Fund’s investments may include foreign securities, including indirect investments such as 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 20% of its net assets in companies outside of the technology industry.  The Portfolio Managers invest in the stocks of companies of any size without regard to market capitalization.

The Portfolio Managers make investment decisions for the Fund on the basis of fundamental security analysis. Once an issuer is identified as an attractive candidate for the Fund’s portfolio, the Portfolio Managers assess the relative value and growth potential of the security on the basis of various factors, which may include price to book ratio, price to earnings ratio, earnings yield and cash flow, among others. The Fund may invest, to a limited degree, in securities issued in initial public offerings (“IPOs”).

Many of the common stocks purchased by the Fund will not pay dividends; instead, stocks will be bought for the potential that their prices will increase and provide capital appreciation for the Fund.
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 companies that are principally engaged in the research, design, development, manufacturing or distributing products or services in the technology 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- 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.

Industry Concentration Risk:  The Fund concentrates its investments within the technology industry.  Because of its narrow industry focus, the performance of the Fund is tied closely to and is affected by developments in the technology industry and its related businesses. The value of the Fund’s shares may fluctuate more than shares of a fund investing in other industries or in a broader range of industries.

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.

Foreign Securities Risk:  The Fund invests in ADRs, which are foreign securities traded on U.S. exchanges.  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.

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 Technology Fund (the “Predecessor Technology 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 Technology Fund. The Predecessor Technology 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 broad measures of market performance, the NASDAQ Composite Index and the S&P 500 Index.  For additional information on these indexes, 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 broad measures of market performance, the NASDAQ Composite Index and the S&P 500 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 TECHNOLOGY 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 18.58% for the quarter ended June 30, 2009 and the lowest quarterly return was -22.74% 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 18.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.74%)
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 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 inception date of the Fund’s Institutional Class shares is March 12, 2010.  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.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2013)
NASDAQ Composite Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel NASDAQ Composite Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 39.36%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 22.73%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.54%
S&P 500 Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel S&P 500 Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 32.39%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 17.94%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.41%
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 1.89%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 3.08%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.09%) [2]
Net Expenses rr_NetExpensesOverAssets 1.99%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 202
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 849
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,521
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 3,316
Annual Return 2004 rr_AnnualReturn2004 6.75%
Annual Return 2005 rr_AnnualReturn2005 11.80%
Annual Return 2006 rr_AnnualReturn2006 9.25%
Annual Return 2007 rr_AnnualReturn2007 9.36%
Annual Return 2008 rr_AnnualReturn2008 (42.89%)
Annual Return 2009 rr_AnnualReturn2009 54.93%
Annual Return 2010 rr_AnnualReturn2010 12.73%
Annual Return 2011 rr_AnnualReturn2011 (10.77%)
Annual Return 2012 rr_AnnualReturn2012 8.67%
Annual Return 2013 rr_AnnualReturn2013 29.75%
Label rr_AverageAnnualReturnLabel Hennessy Technology Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 29.75%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 17.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.99%
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Technology Fund - Investor Returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 29.75%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 17.05%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.13%
Investor Class | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Technology Fund - Investor Returns after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.84%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 13.84%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.55%
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 1.86%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.04% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.80%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.06%) [2]
Net Expenses rr_NetExpensesOverAssets 1.74%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 177
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 768
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,385
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 3,051
Label rr_AverageAnnualReturnLabel Hennessy Technology Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 30.12%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 17.24%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 6.08%
[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, from and after November 1, 2014, 12b-1 fees) do not exceed 1.95% of the average daily net assets of the Investor Class shares of the Fund and 1.70% of the average daily net assets of the Institutional Class shares of the Fund. The Manager has agreed to maintain this expense limitation through February 28, 2015.