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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015
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Inventory [Line Items] |  |
Inventories, net | $ 321,978 | $ 273,875
New Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 276,786 | 230,359
Used Boats, Motors, and Trailers [Member] |  |
Inventory [Line Items] |  |
Inventories, net | 37,591 | 36,992
Parts, Accessories, and Other [Member] |  |
Inventory [Line Items] |  |
Inventories, net | $ 7,601 | $ 6,524

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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=28358313&loc=d3e6676-107765 + Details
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