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Company Background - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Jun. 30, 2019 Store State
Concentration Risk [Line Items] |  |  |  |
Number of retail locations | Store |  |  |  | 67
Number of states wherein retail locations are established | State |  |  |  | 16
Product Concentration Risk [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 40.00% |  |  |
Product Concentration Risk [Member] | Brunswick Sea Ray Boat [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 21.00% |  |  |
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 17.00% |  |  |
Product Concentration Risk [Member] | Brunswick Sea Ray Sport Yacht and Yacht Models [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 10.00% |  |  |
Product Concentration Risk [Member] | Azimut Benetti Groups | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 11.00% |  |  |
Supplier Concentration Risk [Member] | Brunswick [Member] | Sales [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 42.00% |  |  |
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member] |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Revenue percentage from sale of boats | 51.00% | 55.00% | 55.00% |

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