Basis of Financial Statement Presentation (Policies)	6 Months Ended
Basis of Financial Statement Presentation (Policies)	Mar. 31, 2015
Accounting Policies [Abstract]
Revenue Recognition	The Company’s operating revenue consists of contractual investment advisory and shareholder service fees paid to it by the Hennessy Funds. The Company earns investment advisory fees from the Hennessy Funds by, among other things, managing the composition of each Hennessy Fund’s portfolio (including the purchase, retention, and disposition of portfolio securities in accordance with the applicable Hennessy Fund’s investment objectives, policies, and restrictions), conducting investment research, monitoring compliance with each applicable Hennessy Fund’s investment restrictions and applicable laws and regulations, overseeing service providers (including sub-advisors), maintaining an in-house public relations and marketing program for each of the Hennessy Funds, preparing and distributing regulatory reports, and overseeing distribution through third-party financial intermediaries. The Company earns shareholder service fees from the Hennessy Funds by, among other things, maintaining an “800” number that the current investors of the Hennessy Funds may call to ask questions about the Hennessy Funds or their accounts, or to get help with processing exchange and redemption requests or changing account options. These fee revenues are earned and calculated daily by the Hennessy Funds’ accountants at U.S. Bancorp Fund Services, LLC. The fees are computed and billed monthly, at which time they are recognized in accordance with Accounting Standard Codification 605 “Revenue Recognition.”

Disclosure of accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction is generally disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction.

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