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Goodwill Other Intangible Assets and Other Long Term Assets - Additional Information (Detail) $ in Thousands | 1 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2022 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) Segment | Sep. 30, 2023 USD ($) Acquisition | Sep. 30, 2022 USD ($)
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |
Accounts receivable, net |  |  | $ 106,409 | $ 85,780 |
Inventories |  |  | 906,641 | 812,830 |
Short-term borrowings (Floor Plan) |  |  | 708,994 | 537,060 |
Accrued expenses |  |  | 197,295 | 112,746 |
Accounts payable |  |  | $ 54,481 | 71,706 |
Weighted average amortization period |  |  | 4 years 1 month 6 days |  |
Contract liabilities |  |  | $ 64,845 | 81,700 |
Goodwill |  |  | 592,293 | 559,820 | $ 235,585
Other identifiable intangibles |  |  | 37,458 | 39,713 |
Revenue |  |  | 2,431,008 | 2,394,706 | 2,308,098
Income (Loss) before taxes |  |  | 54,331 | 147,435 | $ 261,921
Other intangible assets, net |  |  | 37,458 | 39,713 |
Goodwill and other intangible assets increased from acquisitions |  |  | 30,200 | 353,100 |
Goodwill expected to be deductible for tax purposes |  |  | $ 700 | 216,000 |
Number of reportable segments | Segment |  |  | 2 |  |
Other long-term assets |  |  | $ 32,741 | $ 32,259 |
Number of acquisitions completed | Acquisition |  |  |  | 3 |
C&C Boat Works, Boatzon and Midcoast Marine Group [Member] |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |
Aggregate consideration |  | $ 49,000 |  |  |
Tangible assets acquired |  | 20,300 |  |  |
Goodwill |  | 26,800 |  | $ 13,600 |
Estimated contingent consideration |  | 9,700 |  |  |
Intangible assets |  | 1,900 |  |  |
Cash acquired |  | $ 100 |  |  |
IGY Marinas [Member] |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |
Aggregate purchase price | $ 552,900 |  |  |  |
Tangible assets acquired | 259,400 |  |  |  |
Fair value of contingent consideration | 67,700 |  |  |  |
Goodwill | 293,500 |  | $ 193,300 |  |
Intangible assets | 30,400 |  |  |  |
Cash acquired | $ 28,100 |  |  |  |

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