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Hennessy Large Cap Financial Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Hennessy Large Cap Financial Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Hennessy Large Cap Financial Fund seeks 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’s portfolio turnover rate was 64% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 64.00%
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 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
The Fund invests primarily in companies listed on U.S. national securities exchanges and in foreign companies through American Depositary Receipts or other types of depositary receipts, which are U.S. dollar denominated securities of foreign issuers listed on U.S. national securities exchanges.  The Fund’s investments consist primarily of common stocks.

Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of large-cap companies “principally engaged” in the business of providing financial services.  An issuer is considered “principally engaged” in the business of providing financial services if at least 50% of its assets, gross income, or net profits are committed to, or derived from, financial services activities.  Financial services activities are activities primarily related to consumer and commercial banking, global payments, insurance, securities and investments, specialty finance, and real estate.  Investments may include mortgage banking companies, discount brokerage companies, insurance companies, consumer finance companies, savings and loan associations, savings banks, leasing companies, building and loan associations, cooperative banks, commercial banks, investment companies, other depository institutions, companies in the information technology industries that are primarily engaged in providing products or services to the types of companies listed above, and real estate investment trusts. The Fund considers a large-cap company to be one that has a market capitalization of $3 billion or more, measured at the time of purchase.

When evaluating securities to purchase, the Portfolio Managers generally look for companies that have low price-to-earnings ratios and low price-to-book ratios relative to other financial services companies.  The Portfolio Managers may choose to sell a security if they believe it has reached an excessive valuation level, when the company’s specific metrics or industry fundamentals deteriorate, or if the investment process identifies a potentially superior investment idea. They may also choose to sell a position when the company’s market capitalization drops below $3 billion.

The Fund will not invest more than 5% of its total assets in the equity-related securities of any one company that derives more than 15% of its revenues from brokerage or investment management activities.
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 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.

Temporary Defensive Positions Risk:  From time to time, the Fund may take temporary defensive positions in response to adverse market, economic, or political 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 or short-term obligations.

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

Mortgage and Real Estate Investments Risk: Because the Fund focuses on financial services companies that issue mortgages and invest in mortgage-backed securities and other real estate investments, the Fund is subject to risks associated with the real estate market. Mortgages and real estate investments are particularly sensitive to economic downturns, changes in regulations, and fluctuating interest rates. In particular, they are subject to the risk that borrowers default on their loans and the risk that borrowers prepay some or all of the principal owed to the issuer, in each case causing the investments to fail to realize expected returns.

Industry Concentration Risk:  The Fund concentrates its investments in the financial services group of industries, and its performance is therefore tied closely to, and affected by, industry developments. Financial services companies may be adversely affected by changes in the regulatory environment, interest rate changes, and other factors.

Non-Diversification Risk:  The Fund is non-diversified under the Investment Company Act. Accordingly, the Fund typically invests a greater portion of its assets in, and its performance may be affected by, a smaller number of issuers than if it were a diversified fund. Further, the Fund may experience greater losses as a result of a single issuer’s unfavorable market or economic conditions or other adverse developments impacting the market value of the issuer’s securities.
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 under the Investment Company Act. Accordingly, the Fund typically invests a greater portion of its assets in, and its performance may be affected by, a smaller number of issuers than if it were a diversified fund. Further, the Fund may experience greater losses as a result of a single issuer’s unfavorable market or economic conditions or other adverse developments impacting the market value of the issuer’s securities.
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 an index that reflects a broad measure of market performance, the Russell 1000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell 1000® Financial Services Index.  For additional information on these indices, please see “Descriptions of Indices” on page 69 of this Prospectus.  The Fund is the successor to the FBR Large Cap Financial Fund (the “Predecessor Large Cap Financial Fund”).  The performance information provided for the periods on or prior to October 26, 2012, is historical information for the Predecessor Large Cap Financial Fund, which had the same investment objective and substantially similar 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 an index that reflects a broad measure of market performance, the Russell 1000® Index, as well as an additional index that reflects the market sector in which the Fund invests, the Russell 1000® Financial Services Index.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex We use the Russell 1000® Financial Services Index as an additional index because it compares the Fund’s performance with the return of an index reflecting the performance of investments similar to those of the Fund.
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 LARGE CAP FINANCIAL 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 27.66% for the quarter ended September 30, 2009, and the lowest quarterly return was -21.49% for the quarter ended September 30, 2011.
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.66%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (21.49%)
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 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 sale of Fund shares.
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 and inception dates.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
We use the Russell 1000® Financial Services Index as an additional index because it compares the Fund’s performance with the return of an index reflecting the performance of investments similar to those of the Fund.

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 sale of Fund shares.

The inception date of the Fund’s Institutional Class shares is June 15, 2015.  Performance shown prior to the inception of 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 Institutional Class shares.
Caption rr_AverageAnnualReturnCaption AVERAGE ANNUAL TOTAL RETURNS (for the periods ended December 31, 2018)
Hennessy Large Cap Financial Fund | Russell 1000® Financial Services Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 1000® Financial Services Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (8.11%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.49%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 11.66%
Hennessy Large Cap Financial Fund | Russell 1000® Index (reflects no deduction for fees, expenses, or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Russell 1000® Index (reflects no deduction for fees, expenses, or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.78%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.21%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.28%
Hennessy Large Cap Financial Fund | Investor Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.15%
Shareholder Servicing rr_Component1OtherExpensesOverAssets 0.10%
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.54%
Other Expenses rr_OtherExpensesOverAssets 0.64%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.70%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 173
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 536
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 923
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 2,009
Annual Return 2009 rr_AnnualReturn2009 33.23%
Annual Return 2010 rr_AnnualReturn2010 7.42%
Annual Return 2011 rr_AnnualReturn2011 (18.38%)
Annual Return 2012 rr_AnnualReturn2012 27.77%
Annual Return 2013 rr_AnnualReturn2013 42.03%
Annual Return 2014 rr_AnnualReturn2014 7.85%
Annual Return 2015 rr_AnnualReturn2015 (6.11%)
Annual Return 2016 rr_AnnualReturn2016 14.96%
Annual Return 2017 rr_AnnualReturn2017 19.38%
Annual Return 2018 rr_AnnualReturn2018 (11.73%)
Label rr_AverageAnnualReturnLabel Hennessy Large Cap Financial Fund - Investor Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.73%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.17%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.03%
Hennessy Large Cap Financial Fund | Investor Class | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Large Cap Financial Fund - Investor Returns after taxes on distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (12.34%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.84%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 9.24%
Hennessy Large Cap Financial Fund | Investor Class | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Hennessy Large Cap Financial Fund - Investor Returns after taxes on distributions and sale of Fund shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (6.47%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.16%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.24%
Hennessy Large Cap Financial Fund | Institutional Class  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets 0.90%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Shareholder Servicing rr_Component1OtherExpensesOverAssets none
Remaining Other Expenses rr_Component3OtherExpensesOverAssets 0.44%
Other Expenses rr_OtherExpensesOverAssets 0.44%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 137
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 428
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,624
Label rr_AverageAnnualReturnLabel Hennessy Large Cap Financial Fund - Institutional Returns before taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (11.40%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.46%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 10.18%
[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.