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Significant Accounting Policies - Summary of Percentages of Revenue Generated by Products and Services (Detail) (Sales [Member]) | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
New Boat Sales [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 65.20% | 61.90% | 62.70%
Used Boat Sales [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 16.80% | 19.40% | 17.80%
Maintenance, Repair, Storage and Charter Services [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 7.80% | 8.00% | 8.30%
Finance and Insurance Products [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.60% | 2.80% | 2.80%
Parts and Accessories [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 5.10% | 5.50% | 6.00%
Brokerage Sales [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 2.50% | 2.40% | 2.40%
Product Concentration Risk [Member] |  |  |
Revenue Recognition [Line Items] |  |  |
Sales Revenue Goods And Services Net Percentage | 100.00% | 100.00% | 100.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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