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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Sep. 30, 2016
Inventory [Line Items]
Inventories, net	$ 401,301	$ 321,978
New Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	357,957	276,786
Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	35,211	37,591
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories, net	$ 8,133	$ 7,601

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+ References

No definition available.

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.6(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=68049868&loc=d3e3927-108312

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765

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