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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Sep. 30, 2022
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Inventory [Line Items] |  |
Inventories | $ 812,830 | $ 454,359
Work-in-process | 22,340 | 21,691
Raw materials | 30,612 | 25,835
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories | 625,287 | 272,422
In Transit Inventory and Deposits [Member] |  |
Inventory [Line Items] |  |
Inventories | 115,879 | 117,268
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 18,712 | $ 17,143

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