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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
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Inventory [Line Items] |  |
Inventories, net | $ 209,418 | $ 298,002
Work-in-process | 10,108 |
Raw materials | 9,729 |
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 177,743 | 289,291
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories, net | $ 11,838 | $ 8,711

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