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Significant Accounting Policies - Summary of Percentages of Revenue Generated by Products and Services (Detail) (Sales [Member])	12 Months Ended
	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

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