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Significant Accounting Policies - Summary of Percentages of Revenue Generated by Products and Services (Detail) | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 100.00% | 100.00% | 100.00%
New Boat Sales [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 61.90% | 62.70% | 60.60%
Used Boat Sales [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 19.40% | 17.80% | 19.00%
Maintenance, Repair, Storage and Charter Services [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 8.00% | 8.30% | 8.90%
Finance and Insurance Products [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.80% | 2.80% | 2.70%
Parts and Accessories [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 5.50% | 6.00% | 6.20%
Brokerage Services [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.40% | 2.40% | 2.60%

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