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Significant Accounting Policies - Summary of Percentages of Revenue Generated by Products and Services (Detail)	12 Months Ended
	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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- Definition

Sales revenue goods and services net percentage.

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No definition available.

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