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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Sep. 30, 2023
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amortization of intangible assets | $ 2,100 | $ 3,300 | $ 3,656 | $ 6,600 |
Weighted average useful life |  |  | 3 years 9 months 18 days |  |
Goodwill | 336,602 |  | $ 336,602 |  | $ 336,602
Dealerships |  |  |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | 295,300 |  | 295,300 |  | 295,300
Distribution |  |  |  |  |
Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |
Goodwill | $ 41,300 |  | $ 41,300 |  | $ 41,300

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-1 + Details
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