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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Inventory [Line Items] |  |
Inventories, net | $ 230,984 | $ 298,002
Work-in-process | 11,358 |
Raw materials | 11,959 |
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 193,888 | 289,291
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories, net | $ 13,779 | $ 8,711

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