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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Sep. 30, 2019
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Inventory [Line Items] |  |
Inventories, net | $ 298,002 | $ 477,468
New Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 252,605 | 413,335
Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 36,686 | 56,363
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories, net | $ 8,711 | $ 7,770

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