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Goodwill - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 01, 2022 | Nov. 03, 2021 | Oct. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Sep. 30, 2022
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 558,613,000 |  | $ 558,613,000 |  | $ 235,585,000
Goodwill and other intangible assets, net |  |  |  | 600,700,000 |  | 600,700,000 |  | 246,500,000
Accounts receivable, net |  |  |  | 116,910,000 |  | 116,910,000 |  | 50,287,000
Contract liabilities |  |  |  | 113,934,000 |  | 113,934,000 |  | 144,427,000
Accrued expenses |  |  |  | 113,803,000 |  | 113,803,000 |  | 89,402,000
Goodwill |  |  |  | 558,613,000 |  | 558,613,000 |  | 235,585,000
Revenue |  |  |  | 570,340,000 | $ 610,106,000 | 1,078,267,000 | $ 1,082,797,000 |
Income (Loss) before taxes |  |  |  | 42,125,000 | $ 71,129,000 | 69,141,000 | 117,694,000 |
Inventories |  |  |  | 711,296,000 |  | 711,296,000 |  | $ 454,359,000
Intrepid and Texas MasterCraft [Member] |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |
Aggregate consideration |  | $ 67,200,000 |  |  |  |  |  |
Cash acquired |  | 9,400,000 |  |  |  |  |  |
Estimated contingent consideration |  | 6,000,000.0 |  |  |  |  |  |
Tangible assets acquired |  | 20,300,000 |  |  |  |  |  |
Intangible assets |  | 7,300,000 |  |  |  |  |  |
Goodwill |  | 39,600,000 |  |  |  |  |  |
Goodwill |  | 39,600,000 |  |  |  |  |  |
Texas MasterCraft [Member] |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | 10,700,000 |  |  |  |  |  |
Goodwill |  | $ 10,700,000 |  |  |  |  |  |
IGY Marinas [Member] |  |  |  |  |  |  |  |
Schedule Of Goodwill And Other Assets [Line Items] |  |  |  |  |  |  |  |
Aggregate consideration | $ 551,257,000 |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 480,000,000 |  |  |  |  |
Maximum amount of consideration paid under earnout |  |  | 100,000,000.0 |  |  |  |  |
Fair value of contingent consideration |  |  | $ 67,700,000 |  |  |  |  |
Cash acquired | 28,075,000 |  |  |  |  |  |  |
Estimated contingent consideration | 67,700,000 |  |  |  |  |  |  |
Intangible assets | 30,446,000 |  |  |  |  |  |  |
Goodwill | 293,469,000 |  |  |  |  |  |  |
Accounts receivable, net | 4,500,000 |  |  |  |  |  |  |
Other current assets | 4,100,000 |  |  |  |  |  |  |
Contract liabilities | 13,300,000 |  |  |  |  |  |  |
Tax contingency reserves | 8,000,000.0 |  |  |  |  |  |  |
Accrued expenses | 6,300,000 |  |  |  |  |  |  |
Goodwill | 293,469,000 |  |  |  |  |  |  |
Other identifiable intangibles | 30,400,000 |  |  |  |  |  |  |
Goodwill expected to be deductible for tax purposes | $ 136,400,000 |  |  |  |  |  |  |
Revenue |  |  |  |  |  | 66,400,000 | 6,900,000 |
Income (Loss) before taxes |  |  |  |  |  | 13,500,000 | $ 3,600,000 |
Series of notes receivable |  |  |  | $ 6,500,000 |  | $ 6,500,000 |  |
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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