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Company Background and Basis of Presentation - Additional Information (Detail) | 12 Months Ended
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Sep. 30, 2019 Store State | Sep. 30, 2018 | Sep. 30, 2017
Concentration Risk [Line Items] |  |  |
Number of retail locations | Store | 59 |  |
Number of states wherein retail locations are established | State | 16 |  |
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 | 36.00% |  |
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 | 19.00% |  |
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% | 51.00% | 55.00%

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