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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. 01, 2022 USD ($) | Oct. 31, 2022 USD ($) | Nov. 30, 2021 USD ($) | Jul. 31, 2021 USD ($) | May 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) Segment | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  | $ 85,780 | $ 50,287 |
Inventories |  |  |  |  |  |  | 812,830 | 454,359 |
Short-term borrowings (Floor Plan) |  |  |  |  |  |  | 537,060 | 132,026 |
Accrued expenses |  |  |  |  |  |  | 112,746 | 89,402 |
Accounts payable |  |  |  |  |  |  | 71,706 | 34,342 |
Contract liabilities |  |  |  |  |  |  | 81,700 | 144,427 |
Goodwill |  |  |  |  |  |  | 559,820 | 235,585 | $ 195,563
Other identifiable intangibles |  |  |  |  |  |  | 39,713 | 10,886 |
Revenue |  |  |  |  |  |  | 2,394,706 | 2,308,098 | 2,063,257
Income (Loss) before taxes |  |  |  |  |  |  | 147,435 | 261,921 | $ 205,794
Other intangible assets, net |  |  |  |  |  |  | 39,713 | 10,886 |
Goodwill and other intangible assets increased from acquisitions |  |  |  |  |  |  | 353,100 | 45,300 |
Goodwill expected to be deductible for tax purposes |  |  |  |  |  |  | $ 216,000 | 10,500 |
Number of reportable segments | Segment |  |  |  |  |  |  | 2 |  |
Other long-term assets |  |  |  |  |  |  | $ 32,259 | 9,455 |
Nisswa Marine, Inc [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 15,300 |  |  |  |  |
Cruisers Yachts [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  | $ 62,700 |  |  |  |
Accounts receivable, net |  |  |  |  | 3,100 |  |  |  |
Inventories |  |  |  |  | 26,200 |  |  |  |
Short-term borrowings (Floor Plan) |  |  |  |  | 11,700 |  |  |  |
Accrued expenses |  |  |  |  | 10,300 |  |  |  |
Accounts payable |  |  |  |  | 3,000 |  |  |  |
Goodwill |  |  |  |  | 40,134 |  |  |  |
Intangible assets |  |  |  |  | 4,602 |  |  |  |
Cash acquired |  |  |  |  | $ 5,993 |  |  |  |
Cruisers Yachts [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life |  |  |  |  | 2 years |  |  |  |
Intrepid And Texas Master Craft [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Aggregate consideration |  |  | $ 67,200 |  |  |  |  |  |
Tangible assets acquired |  |  | 20,300 |  |  |  |  |  |
Goodwill |  |  | 39,600 |  |  |  |  |  |
Estimated contingent consideration |  |  | 6,000 |  |  |  |  |  |
Intangible assets |  |  | 7,300 |  |  |  |  |  |
Cash acquired |  |  | 9,400 |  |  |  |  |  |
Texas Master Craft [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  | $ 10,700 |  |  |  |  |  |
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 consideration | $ 552,905 |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 480,000 |  |  |  |  |  |  |
Accounts receivable, net | 4,500 |  |  |  |  |  |  |  |
Other current assets | 4,100 |  |  |  |  |  |  |  |
Accrued expenses | 6,400 |  |  |  |  |  |  |  |
Maximum amount of consideration paid under earnout |  | 100,000 |  |  |  |  |  |  |
Fair value of contingent consideration |  | $ 67,700 |  |  |  |  |  |  |
Contract liabilities | 13,300 |  |  |  |  |  |  |  |
Tax contingency reserves | 8,500 |  |  |  |  |  |  |  |
Goodwill | 293,542 |  |  |  |  |  |  |  |
Other identifiable intangibles | 30,400 |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  | 112,400 | 96,800 |
Income (Loss) before taxes |  |  |  |  |  |  | 18,100 | $ 5,600 |
Other intangible assets, net | 30,400 |  |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes | 193,300 |  |  |  |  |  |  |  |
Estimated contingent consideration | 67,700 |  |  |  |  |  |  |  |
Intangible assets | 30,446 |  |  |  |  |  |  |  |
Cash acquired | $ 28,075 |  |  |  |  |  |  |  |
IGY Marinas [Member] | Related Party [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Series of notes receivable |  |  |  |  |  |  | $ 6,300 |  |
IGY Marinas [Member] | Customer Relationships [Member] |  |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |  |
Weighted average useful life | 4 years 6 months |  |  |  |  |  |  |  |

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