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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Sep. 30, 2022
Inventory [Line Items]
Inventories	$ 711,296	$ 454,359
Work-in-process	24,500	21,691
Raw materials	28,056	25,835
New and Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories	523,788	272,422
In Transit Inventory and Deposits [Member]
Inventory [Line Items]
Inventories	113,966	117,268
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories	$ 20,986	$ 17,143

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+ References

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-Name Accounting Standards Codification
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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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