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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
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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