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Company Background - Additional Information (Detail) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2025 Location | Jun. 30, 2024 | Jun. 30, 2025 Location | Jun. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Jun. 30, 2025 RetailDealership | Jun. 30, 2025 Marina
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Number of retail locations | 120 |  | 120 |  |  |  |  | 70 | 65
Product Concentration Risk [Member] | Sales [Member] |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue percentage from sale of boats | 100.00% | 100.00% | 100.00% | 100.00% |  |  |  |  |
Product Concentration Risk [Member] | Brunswick [Member] | Sales [Member] |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue percentage from sale of boats |  |  |  |  | 20.00% |  |  |  |
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member] |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue percentage from sale of boats |  |  |  |  | 9.00% |  |  |  |
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member] |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue percentage from sale of boats |  |  |  |  | 9.00% |  |  |  |
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member] |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue percentage from sale of boats |  |  |  |  | 8.00% |  |  |  |
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member] |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |
Revenue percentage from sale of boats |  |  |  |  | 53.00% | 53.00% | 51.00% |  |

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