Management Contracts Purchased	9 Months Ended
Jun. 30, 2022
Text Block [Abstract]
Management Contracts Purchased	Throughout its history, the Company has completed 10 purchases of the assets related to the management of 30 different mutual funds, some of which were reorganized into already existing Hennessy Funds. In accordance with Financial Accounting Standards Board (“FASB”) guidance, the Company periodically reviews the carrying value of its management contracts asset to determine if any impairment has occurred. The fair value of the management contracts asset was estimated as of September 30, 2021, by applying the income approach and is based on management estimates and assumptions, including third-party valuations that utilize appropriate valuation techniques. It was determined there was no impairment as of such date. As of June 30, 2022, management performed a qualitative analysis and determined it was more likely than not that there continued to be no impairment. Under Accounting Standards Codification 350 — Intangibles – Goodwill and Other, intangible assets that have indefinite useful lives are not amortized but are tested at least annually for impairment. The Company reviews the useful life of the management contracts each reporting period to determine if they continue to have an indefinite useful life.

Throughout its history, the Company has completed 10 purchases of the assets related to the management of 30 different mutual funds, some of which were reorganized into already existing Hennessy Funds. In accordance with Financial Accounting Standards Board (“FASB”) guidance, the Company periodically reviews the carrying value of its management contracts asset to determine if any impairment has occurred. The fair value of the management contracts asset was estimated as of September 30, 2021, by applying the income approach and is based on management estimates and assumptions, including

third-party

valuations that utilize appropriate valuation techniques. It was determined there was no impairment as of such date. As of June 30, 2022, management performed a qualitative analysis and determined it was more likely than not that there continued to be no impairment.

Under Accounting Standards Codification 350 — Intangibles – Goodwill and Other, intangible assets that have indefinite useful lives are not amortized but are tested at least annually for impairment. The Company reviews the useful life of the management contracts each reporting period to determine if they continue to have an indefinite useful life.