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Hennessy Japan Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Japan Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Japan 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 1% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 1.00%
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 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 those 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 Japanese companies.  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 equity 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 other investment companies (including exchange-traded funds, referred to as ETFs) that invest in equity securities of Japanese companies.  The Fund invests in companies regardless of market capitalization. As of January 31, 2019, the average market capitalization of the stocks held by the Fund was $36.8 billion.

While the Fund is considered a diversified mutual fund, it employs a relatively concentrated investment strategy and may hold securities of fewer issuers than other diversified funds.

Using in-depth analysis and on-site research, the Portfolio Managers focus on stocks with a potential “value gap” by screening for companies that they identify as having strong businesses and management, trading at an attractive price.  The Portfolio Managers limit the portfolio to what they consider to be their best ideas and maintain a concentrated number of holdings. 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, that a company’s stock is fully valued by the market, or that the company is beginning to show deteriorating fundamentals.  They also may sell an investment if it becomes, in their determination, too large of a 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 and Equity Investments 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-Sized and Medium-Sized Companies Risk:  The Fund may invest in small-sized and medium-sized companies, which may have more limited liquidity and greater price volatility than larger, more established companies. Smaller companies may have limited product lines, markets, and financial resources, and their management may be dependent on a limited number of key individuals.

Foreign Securities, Foreign Currency, and Japan-Specific Risk: There are specific risks associated with investing in the securities of foreign companies, including fluctuations in the exchange rates of foreign currencies that impact the U.S. dollar value of a security. The Fund concentrates its investments in the securities of Japanese companies, and the Fund’s performance may be affected by the social, political, and economic conditions in Japan. The Japanese economy has at times in the past been negatively affected by government intervention and protectionism, a deflationary macroeconomic environment, a heavy reliance on international trade, and natural disasters. Some of these factors, as well as a large government debt burden, an aging population, and changes to fiscal, monetary, or trade policies, may affect Japanese markets and the Fund’s performance. Japan’s international trade impacts Japan’s economic growth, and adverse economic conditions in the United States or other trading partners may affect Japan. 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, and social instability in those countries.

Industry Concentration Risk: From time to time, the Fund may concentrate its investments in one or more industry sectors. The Fund is currently substantially invested in the industrials sector, and its performance is therefore affected by industry developments. Companies in the industrials sector may be adversely affected by changes in the supply of and demand for products and services, product obsolescence, environmental liabilities, and product liability.

Investment Company Securities Risk: When the Fund invests in another investment company (including an ETF), 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 the other investment company’s losses and the level of risk arising from its investment practices (such as the use of leverage). The Fund has no control over the risks taken by the other investment company.
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 one, five, and ten years compare with those of indices that reflect broad measures of market performance, the Russell/Nomura Total Market™ Index and the Tokyo Stock Price Index (TOPIX). For additional information on these indices, please see “Descriptions of Indices” on page 69 of this Prospectus.  The Fund is the successor to the Hennessy Japan Fund, a series of Hennessy SPARX Funds Trust (the “Predecessor Japan Fund”). The performance information provided for the periods on or prior to February 28, 2014, is historical information for the Predecessor Japan 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 at www.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 one, five, and ten years compare with those of indices that reflect broad measures of market performance, the Russell/Nomura Total Market™ Index and the Tokyo Stock Price Index (TOPIX).
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.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 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 19.12% for the quarter ended June 30, 2009, and the lowest quarterly return was -13.97% for the quarter ended March 31, 2009.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 19.12%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2009
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.97%)
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 highest historical individual stated 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 individual 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 Additionally, the Fund’s “return after taxes on distributions” may be higher than its “returns before taxes” because it may include a tax benefit due to the capital losses generated by distributions.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
Performance of the Fund’s Institutional Class shares differs from that of the Fund’s Investor Class shares because the share classes have different expenses.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The after-tax returns are calculated using the highest historical individual stated federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an individual 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 sale of Fund shares” may be higher than its “returns before taxes” or “returns after taxes on distributions” because it may include a tax benefit due to the capital losses generated by the distributions or sale of Fund shares. Additionally, the Fund’s “return after taxes on distributions” may be higher than its “returns before taxes” because it may include a tax benefit due to the capital losses generated by distributions.

Returns are presented in U.S. dollar terms.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2018)
Hennessy Japan Fund | Russell/Nomura Total Market Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell/Nomura Total Market Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (14.42%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.02%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.85%
Hennessy Japan 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 (14.30%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.91%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 5.75%
Hennessy Japan 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%
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10%
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.38%
Other Expenses rr_OtherExpensesOverAssets 0.48%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.44%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 147
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 456
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 787
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,724
Annual Return 2009 rr_AnnualReturn2009 9.83%
Annual Return 2010 rr_AnnualReturn2010 20.64%
Annual Return 2011 rr_AnnualReturn2011 0.29%
Annual Return 2012 rr_AnnualReturn2012 11.61%
Annual Return 2013 rr_AnnualReturn2013 26.16%
Annual Return 2014 rr_AnnualReturn2014 6.98%
Annual Return 2015 rr_AnnualReturn2015 12.95%
Annual Return 2016 rr_AnnualReturn2016 11.26%
Annual Return 2017 rr_AnnualReturn2017 32.04%
Annual Return 2018 rr_AnnualReturn2018 (6.57%)
Label rr_AverageAnnualReturnLabel Hennessy Japan Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.57%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.65%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.99%
Hennessy Japan Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Japan Fund - Investor Returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.47%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 10.67%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.02%
Hennessy Japan Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Japan Fund - Investor Returns after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (3.78%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.50%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.08%
Hennessy Japan 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
Shareholder Servicing rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.21%
Other Expenses rr_OtherExpensesOverAssets 0.21%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.02%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 325
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 563
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,248
Label rr_AverageAnnualReturnLabel Hennessy Japan Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.19%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 11.02%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 12.29%
[1] Acquired fund fees and expenses are not reflected in the Fund's financial statements, so the information presented in the expense table may differ from that presented in the financial highlights.