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Company Background and Basis of Presentation - Additional Information (Detail) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Product Information [Line Items] |  |  |
Number of retail locations | 54 |  |
Number of states wherein retail locations are established | 17 |  |
Azimut Yachts [Member] | Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 14.00% |  |
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 52.00% | 51.00% | 49.00%
New Boat Sales [Member] | Sales [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 65.20% | 61.90% | 62.70%
New Boat Sales [Member] | Sales [Member] | Brunswick's Contribution [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 40.00% |  |
Brunswick Sea Ray Boat [Member] | Sales [Member] | Brunswick's Contribution [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 26.00% |  |
Brunswick Boston Whaler Boats [Member] | Sales [Member] | Brunswick's Contribution [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 10.00% |  |
Supplier Concentration Risk [Member] | Sales [Member] | Brunswick's Contribution [Member] |  |  |
Product Information [Line Items] |  |  |
Revenue percentage from sale of boats | 43.00% |  |

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