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Summary of Significant Accounting Policies - Consolidation and Property and Equipment - Additional Information (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Property and Equipment, Net [Line Items] |  |  |
Property Plant And Equipment Depreciation Methods | straight-line method |  |
Immaterial impairment of long-lived assets | There was an immaterial impairment of long-lived assets in fiscal years 2023 and 2022 | There was an immaterial impairment of long-lived assets in fiscal years 2023 and 2022 |
Impairment of long-lived assets |  |  | $ 0
Minimum [Member] | Building and Building Improvements [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Estimated useful life of assets | 10 years |  |
Minimum [Member] | Furniture and Fixtures [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Estimated useful life of assets | 5 years |  |
Minimum [Member] | Computer, Equipment And Software [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Estimated useful life of assets | 4 years |  |
Maximum [Member] | Building and Building Improvements [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Estimated useful life of assets | 30 years |  |
Maximum [Member] | Furniture and Fixtures [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Estimated useful life of assets | 10 years |  |
Maximum [Member] | Computer, Equipment And Software [Member] |  |  |
Property and Equipment, Net [Line Items] |  |  |
Estimated useful life of assets | 10 years |  |

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- Definition Describes an entity's accounting treatment for disposals of property, plant and equipment, including gains and losses related thereto. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -SubTopic 10 -Topic 360 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480091/360-10-S99-1 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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