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Label Element Value
Hennessy Japan Small Cap Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Japan Small Cap Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Japan Small Cap 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)
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 had a portfolio turnover rate of 63% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 63.00%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent “Other Expenses” have been restated to reflect current administration and related fees included in “All Remaining Other Expenses.”
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Because of this restatement, the “Total Annual Fund Operating Expenses” do not correlate to the ratio of expenses to average net assets shown in the Fund’s most recent annual report. “Other Expenses” include acquired fund fees and expenses that do not exceed 0.01% of the Fund's average daily net assets. 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 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, plus the amount of any borrowings for investment purposes, in equity securities of smaller Japanese companies, generally defined as those companies with market capitalizations in the bottom 15% of all publicly-traded Japanese companies.  As of December 31, 2014, the bottom 15% of publicly-traded Japanese companies had market capitalizations under approximately 158 billion Japanese yen, or the equivalent of $1.32 billion.  This market capitalization range will vary due to market conditions.  The Fund considers a Japanese company to be a company organized under the laws of Japan, for which the principal securities trading market is Japan, or that has a majority of its assets or business in Japan. The Fund’s investments may include common stocks, preferred stocks, warrants and other rights, and securities convertible into or exchangeable for common stocks, such as convertible bonds.  The Fund’s investments also may include investments in Japan real estate investment trusts or funds and pooled investment vehicles such as exchange-traded funds (“ETFs”) that invest in equity securities of Japanese companies.

Using in-depth analysis and on-site research, the Portfolio Managers focus on stocks with a potential “value gap” by screening for small-cap companies that they identify as having strong businesses and management, trading at an attractive price.  The portfolio is limited to what the Portfolio Managers’ consider to be their best ideas and is unconfined to benchmarks.  The Portfolio Managers typically sell an investment when the reasons for buying it no longer apply, such as when they determine that a company’s prospects have changed or believe that a company’s stock is fully valued by the market, or when the company begins to show deteriorating fundamentals. They also may sell an investment if it becomes, in their determination, an overweighted portfolio position in the Fund.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
As with any security, there are market and investment risks associated with an investment in the Fund. The value of an 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. 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.

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.

Japan Risk:  The Fund invests in the stock of companies operating in Japan.  Because Japan’s economy and equity market share a strong correlation with the U.S. markets, the Japanese economy may be affected by economic problems in the U.S. Japan also has a growing economic relationship with China and other Southeast Asian countries, and thus Japan’s economy may also be affected by economic, political or social instability in those countries.  Despite a strengthening in the economic relationship between Japan and China, the countries’ political relationship has at times been strained in recent years.  Should political tension increase, it could adversely affect the economy and destabilize the region as a whole.  Japan also remains heavily dependent on oil imports, and higher commodity prices could therefore have a negative impact on the economy.  Japanese securities may also be subject to lack of liquidity; excessive taxation; government seizure of assets; different legal or accounting standards and less government supervision and regulation of exchanges than in the United States.  Furthermore, the natural disasters that have impacted Japan and the ongoing recovery efforts have had a negative affect on Japan’s economy, and may continue to do so.

Pooled Investment Vehicles Risk:  When the Fund invests in another pooled investment vehicle (including ETFs), it will indirectly bear its proportionate share of any fees and expenses payable directly by the other pooled investment vehicle. 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 investment vehicle and the level of risk arising from the investment practices of the underlying investment vehicle (such as the use of leverage). The Fund has no control over the risks taken by the underlying investment vehicle in which it invests.

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 an 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 and 5 years and since inception compare with those of an index that reflects a broad measure of market performance, the Tokyo Stock Price Index (TOPIX), as well as an additional index that reflects the types of securities in which the Fund invests, the Russell/Nomura Small Cap™ Index. For additional information on these indices, please see “Index Descriptions” on page 66 of this Prospectus.  The performance information shown 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.  Prior to June 15, 2015, the date that this Prospectus was amended and restated, the Institutional Class shares were not offered to investors.  The Fund is the successor to the Hennessy Japan Small Cap Fund, a series of Hennessy SPARX Funds Trust (the “Predecessor Japan Small Cap Fund”). The performance information provided for the periods on or prior to February 28, 2014 is historical information for the Predecessor Japan Small Cap Fund, which was managed by the same investment adviser and had the same investment objective and investment strategy as the 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 and 5 years and since inception compare with those of an index that reflects a broad measure of market performance, the Tokyo Stock Price Index (TOPIX), as well as an additional index that reflects the types of securities in which the Fund invests, the Russell/Nomura Small Cap™ Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the Russell/Nomura Small Cap™ Index as an additional index because it compares the Fund's performance with the returns of an index holding investments similar to those of the Fund.
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 JAPAN SMALL CAP 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 33.58% for the quarter ended June 30, 2009 and the lowest quarterly return was -19.87% for the quarter ended September 30, 2008.

The year-to-date return of the Fund ’s Investor Class shares through March 31, 2015 was 5.07%.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 5.07%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.87%)
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 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
We use the Russell/Nomura Small Cap™ Index as an additional index because it compares the Fund's performance with the returns of an index holding investments similar to those of the Fund.

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 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.

Returns are presented in U.S. Dollar terms.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2014)
Hennessy Japan Small Cap Fund | Russell/Nomura Small Cap™ Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell/Nomura Small Cap™ Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.50%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.80%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.24%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2007
Hennessy Japan Small Cap Fund | TOPIX (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel TOPIX (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.49%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.80%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception (0.25%)
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2007
Hennessy Japan Small Cap Fund | 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 1.20%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10%
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.88%
Other Expenses [1] rr_OtherExpensesOverAssets 0.98%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.18%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 221
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 682
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,169
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,513
Annual Return 2008 rr_AnnualReturn2008 (22.31%)
Annual Return 2009 rr_AnnualReturn2009 13.88%
Annual Return 2010 rr_AnnualReturn2010 23.99%
Annual Return 2011 rr_AnnualReturn2011 (4.17%)
Annual Return 2012 rr_AnnualReturn2012 12.76%
Annual Return 2013 rr_AnnualReturn2013 33.17%
Annual Return 2014 rr_AnnualReturn2014 8.75%
Label rr_AverageAnnualReturnLabel Hennessy Japan Small Cap Fund Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 8.75%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 14.18%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 8.07%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Aug. 31, 2007
Hennessy Japan Small Cap Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Japan Small Cap Fund Returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.56%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.26%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.07%
Hennessy Japan Small Cap Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Japan Small Cap Fund Returns after taxes on distributions and sale of fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 6.91%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.89%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 6.14%
Hennessy Japan Small Cap Fund | 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 1.20%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing rr_Component1OtherExpensesOverAssets none
All Remaining Other Expenses rr_Component2OtherExpensesOverAssets 0.79%
Other Expenses [2] rr_OtherExpensesOverAssets 0.79%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.99%
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates “Other Expenses ” are based on estimated amounts for the current fiscal year.
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 202
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 624
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,073
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,317
[1] "Other Expenses" have been restated to reflect current administration and related fees included in "All Remaining Other Expenses." Because of this restatement, the "Total Annual Fund Operating Expenses" do not correlate to the ratio of expenses to average net assets shown in the Fund's most recent annual report. "Other Expenses" include acquired fund fees and expenses that do not exceed 0.01% of the Fund's average daily net assets. 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] "Other Expenses " are based on estimated amounts for the current fiscal year.