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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Sep. 30, 2023
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Inventory [Line Items] |  |
Inventories | $ 876,233 | $ 812,830
Work-in-process | 24,706 | 22,340
Raw materials | 27,912 | 30,612
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories | 702,351 | 625,287
In Transit Inventory and Deposits [Member] |  |
Inventory [Line Items] |  |
Inventories | 103,743 | 115,879
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 17,521 | $ 18,712

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