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Company Background - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2021 Store State
Concentration Risk [Line Items] |  |  |  |
Number of retail locations | Store |  |  |  | 77
Number of states wherein retail locations are established | State |  |  |  | 21
Product Concentration Risk [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 33.00% |  |  |
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 15.00% |  |  |
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 16.00% |  |  |
Product Concentration Risk [Member] | Azimut Benetti Groups and Yachts | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 9.00% |  |  |
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 54.00% | 54.00% | 51.00% |

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