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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Inventory [Line Items]
Inventories	$ 454,359	$ 230,984
Work-in-process	21,691	11,358
Raw materials	25,835	11,959
New and Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories	272,422	143,267
In Transit Inventory and Deposits [Member]
Inventory [Line Items]
Inventories	117,268	50,621
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories	$ 17,143	$ 13,779

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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.

+ References

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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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