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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Inventory [Line Items]
Inventories	$ 1,035,183	$ 906,641
Work-in-process	23,258	24,996
Raw materials	21,385	22,454
New and Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories	903,580	784,152
In Transit Inventory and Deposits [Member]
Inventory [Line Items]
Inventories	73,722	60,470
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories	$ 13,238	$ 14,569

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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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