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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Inventory [Line Items]
Inventories	$ 906,641	$ 812,830
Work-in-process	24,996	22,340
Raw materials	22,454	30,612
New and Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories	784,152	625,287
In Transit Inventory and Deposits [Member]
Inventory [Line Items]
Inventories	60,470	115,879
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories	$ 14,569	$ 18,712

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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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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