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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
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Inventory [Line Items] |  |
Inventories | $ 739,114 | $ 454,359
Work-in-process | 25,281 | 21,691
Raw materials | 29,193 | 25,835
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories | 558,144 | 272,422
In Transit Inventory and Deposits [Member] |  |
Inventory [Line Items] |  |
Inventories | 106,228 | 117,268
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 20,268 | $ 17,143

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