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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
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Inventory [Line Items] |  |
Inventories | $ 973,410 | $ 906,641
Work-in-process | 22,438 | 24,996
Raw materials | 18,183 | 22,454
New and Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories | 860,690 | 784,152
In Transit Inventory and Deposits [Member] |  |
Inventory [Line Items] |  |
Inventories | 57,024 | 60,470
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories | $ 15,075 | $ 14,569

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