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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Cornerstone Mid Cap 30 Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Cornerstone Mid Cap 30 Fund seeks long-term growth of capital.
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 predecessor to the Fund, the Hennessy Cornerstone Mid Cap 30 Fund, a series of Hennessy Mutual Funds, Inc. (the “Predecessor Mid Cap 30 Fund”), had a portfolio turnover rate of 212% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 212.00%
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 this 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
The Fund normally invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in medium cap growth-oriented stocks (medium cap companies are companies with a market capitalization of $1 billion to $10 billion) by utilizing a highly disciplined, purely quantitative formula known as the Cornerstone Mid Cap 30 Formula® (the “Formula”). The Formula selects companies which have between $1 billion and $10 billion in market value, and excludes American Depositary Receipts, or “ADRs”. The Formula selects the 30 common stocks with the highest one-year price appreciation as of the date of purchase that also meet the following criteria:

 
1)
Price-to-sales ratio below 1.5  
   
This value criterion helps to uncover relative bargains. The Formula uses sales as its guide because sales figures are more difficult for companies to manipulate than earnings and frequently provide a clearer picture of a company’s potential value.
     
 
2)
Annual earnings that are higher than the previous year
   
While we have found that sales may be the best indicator of a company’s value, the Formula considers improved earnings to be a key indicator of a company’s financial strength.

 
3)
Positive stock price appreciation, or relative strength, over the past three and six-month periods.
   
Historically, relative strength has been one of the most influential variables in predicting which stocks will outperform the market.

The Fund purchases 30 stocks as dictated by the Formula, weighted equally by dollar amount, with 3.33% of the portfolio’s assets invested in each. Using the Formula, the universe of stocks is re-screened and the portfolio is rebalanced annually, generally in the fall. Stocks meeting the Formula’s criteria not currently in the portfolio are purchased, and stocks that no longer meet the criteria are sold. Holdings of all stocks in the Fund that continue to meet the criteria are appropriately increased or decreased to result in an equal 3.33% weighting.
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.

Formula Investing Risk: The Fund will adhere to the Formula during the course of the year, subject to applicable Securities and Exchange Commission requirements and federal tax requirements relating to mutual funds, despite any adverse developments that may arise. This could result in substantial losses to the Fund, if for example, the stocks selected for the Fund for a given year are experiencing financial difficulty, or are out of favor in the market because of weak performance, a poor earnings forecast, negative publicity or general market cycles. The Fund’s portfolio is rebalanced annually in accordance with the Formula, which may result in the elimination of better performing assets from the Fund’s investments and increases in investments with relatively lower total return.

Medium-Sized Companies Risk: The Fund invests in medium-sized companies, which may have more limited liquidity and greater price volatility than larger, more established companies.

Growth Style Risk:  A growth style of investing may subject the Fund to above-average fluctuations as a result of seeking higher than average capital growth.  Historically, growth stocks have performed best during later stages of economic expansion and value stocks have performed best during periods of economic recovery.  There is the risk that the growth investment style may be out of favor for a period of time.  At times when the style is out of favor, the Fund may underperform the market in general, its benchmark and other mutual funds.

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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The Fund is the successor to the Predecessor Mid Cap 30 Fund pursuant to a reorganization that took place after the close of business on February 28, 2014. The performance information provided for the periods on or prior to February 28, 2014 is historical information for the Predecessor Mid Cap 30 Fund. The Predecessor Mid Cap 30 Fund was managed by the same investment adviser as the Fund and had the same investment objective and investment strategy as the Fund.

The following performance information provides some indication of the risks of investing in the Fund by showing 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 Russell Midcap® Index and the S&P 500 Index. For additional information on these indices, 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 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 Russell Midcap 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 CORNERSTONE MID CAP 30 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 17.97% for the quarter ended March 31, 2006 and the lowest quarterly return was -22.59% for the quarter ended September 30, 2008.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2006
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.59%)
Performance Table Market Index Changed rr_PerformanceTableMarketIndexChanged The Fund's primary index has changed. Previously, the Fund used the S&P Midcap 400 Index as its primary index. The Fund is now compared to the Russell Midcap Index so that the fund complex is consistently benchmarking against the appropriate Russell index when benchmarking against discrete asset classes. The average annual total returns of the S&P Midcap 400 Index for the one-year, five-year and ten-year periods ended December 31, 2013 were 33.50%, 21.89%, and 10.36%, 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 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.

The inception date of the Fund’s Institutional Class is March 3, 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 primary index has changed.  Previously, the Fund used the S&P Midcap 400 Index as its primary index.  The Fund is now compared to the Russell Midcap® Index so that the fund complex is consistently benchmarking against the appropriate Russell index when benchmarking against discrete asset classes.  The average annual total returns of the S&P Midcap 400 Index for the one-year, five-year and ten-year periods ended December 31, 2013 were 33.50%, 21.89%, and 10.36%, respectively.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2013)
Russell MidCap® Index
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell Midcap® Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 34.76%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 22.36%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.22%
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 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10%
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.47%
Other Expenses rr_OtherExpensesOverAssets 0.57%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.31%
Net Expenses rr_NetExpensesOverAssets 1.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 133
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 415
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 718
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,579
Annual Return 2004 rr_AnnualReturn2004 14.10%
Annual Return 2005 rr_AnnualReturn2005 32.74%
Annual Return 2006 rr_AnnualReturn2006 11.91%
Annual Return 2007 rr_AnnualReturn2007 6.69%
Annual Return 2008 rr_AnnualReturn2008 (33.10%)
Annual Return 2009 rr_AnnualReturn2009 24.67%
Annual Return 2010 rr_AnnualReturn2010 27.26%
Annual Return 2011 rr_AnnualReturn2011 4.05%
Annual Return 2012 rr_AnnualReturn2012 14.10%
Annual Return 2013 rr_AnnualReturn2013 29.63%
Label rr_AverageAnnualReturnLabel Hennessy Cornerstone Mid Cap 30 Fund - Investor Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 29.63%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 19.55%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.44%
Investor Class | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Cornerstone Mid Cap 30 Fund - Investor Return after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 27.40%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 19.09%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.74%
Investor Class | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Cornerstone Mid Cap 30 Fund - Investor Return after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 18.56%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 15.98%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.53%
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 0.74%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing rr_Component1OtherExpensesOverAssets none
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.37%
Other Expenses rr_OtherExpensesOverAssets 0.37%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.11%
Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.13%) [1]
Net Expenses rr_NetExpensesOverAssets 0.98%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 100
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 340
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 599
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,340
Label rr_AverageAnnualReturnLabel Hennessy Cornerstone Mid Cap 30 Fund - Institutional Return before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 30.06%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 20.00%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.68%
[1] The Fund's investment manager has contractually agreed to insure that total operating expenses (excluding certain expenses such as acquired fund fees and expenses) do not exceed 0.98% of the average daily net assets of the Institutional Class shares of the Fund. This contractual arrangement will continue indefinitely unless the Fund's Board of Trustees terminates it.