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Company Background and Basis of Presentation - Additional Information (Detail) | 12 Months Ended |
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Sep. 30, 2023 Location | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2023 RetailDealership | Sep. 30, 2023 Marina
Concentration Risk [Line Items] |  |  |  |  |
Number of retail locations | 130 |  |  | 79 | 66
Product Concentration Risk [Member] | Sales [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue percentage from sale of boats | 100.00% | 100.00% | 100.00% |  |
Product Concentration Risk [Member] | Brunswick [Member] | Sales [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue percentage from sale of boats | 24.00% |  |  |  |
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue percentage from sale of boats | 11.00% |  |  |  |
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue percentage from sale of boats | 11.00% |  |  |  |
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue percentage from sale of boats | 11.00% |  |  |  |
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member] |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Revenue percentage from sale of boats | 53.00% | 51.00% | 50.00% |  |

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