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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Inventory [Line Items]
Inventories	$ 812,830	$ 454,359
Work-in-process	22,340	21,691
Raw materials	30,612	25,835
New and Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories	625,287	272,422
In Transit Inventory and Deposits [Member]
Inventory [Line Items]
Inventories	115,879	117,268
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories	$ 18,712	$ 17,143

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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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