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Company Background and Basis of Presentation - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2015 Store State	Sep. 30, 2014	Sep. 30, 2013
Concentration Risk [Line Items]
Number of retail locations	53
Number of states wherein retail locations are established | State	15
Product Concentration Risk [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	100.00%	100.00%	100.00%
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	25.00%
Product Concentration Risk [Member] | Brunswick Boston Whaler Boats [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	12.00%
Product Concentration Risk [Member] | Azimut Benetti Groups | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	12.00%
Supplier Concentration Risk [Member] | Brunswick [Member] | Sales [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	45.00%
Geographic Concentration Risk [Member] | Sales [Member] | Florida [Member]
Concentration Risk [Line Items]
Revenue percentage from sale of boats	53.00%	52.00%	51.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 275



-SubTopic 10



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