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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Sep. 30, 2021
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Inventory [Line Items] |  |
Inventories | $ 454,359 | $ 230,984
Work-in-process | 21,691 | 11,358
Raw materials | 25,835 | 11,959
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories | 272,422 | 143,267
In Transit Inventory and Deposits [Member] |  |
Inventory [Line Items] |  |
Inventories | 117,268 | 50,621
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 17,143 | $ 13,779

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