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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Inventory [Line Items]
Inventories, net	$ 374,217	$ 230,984
Work-in-process	19,611	11,358
Raw materials	28,256	11,959
New and Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	173,708	143,267
In Transit Inventory and Deposits [Member]
Inventory [Line Items]
Inventories, net	134,252	50,621
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories, net	$ 18,390	$ 13,779

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