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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
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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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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