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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Inventory [Line Items] |  |
Inventories, net | $ 477,468 | $ 377,074
New Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 413,335 | 332,320
Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 56,363 | 35,999
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories, net | $ 7,770 | $ 8,755

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