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Inventories - Summary of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Inventory [Line Items]
Inventories, net	$ 298,002	$ 477,468
New Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	252,605	413,335
Used Boats, Motors, and Trailers [Member]
Inventory [Line Items]
Inventories, net	36,686	56,363
Parts, Accessories, and Other [Member]
Inventory [Line Items]
Inventories, net	$ 8,711	$ 7,770

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

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