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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
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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