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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
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Inventory [Line Items] |  |
Inventories, net | $ 325,396 | $ 230,984
Work-in-process | 19,161 | 11,358
Raw materials | 23,253 | 11,959
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 267,316 | 193,888
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories, net | $ 15,666 | $ 13,779

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