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.

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

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Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hzo_CruisersYachtsMember
Namespace Prefix:
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- Details

Name:	us-gaap_BusinessAcquisitionAxis=hzo_SkipperBudsMember
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Goodwill Intangible Assets and Other Long Term Assets - Summary of Estimated Fair Value of Assets Acquired and Liabilities Assumed at Acquisition Date (Parenthetical) (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Oct. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	May 31, 2021
Business Acquisition [Line Items]
Cash purchase price and net working capital adjustments, net of cash acquired		$ 134,205	$ 19,766	$ 40,713
Cruisers Yachts [Member]
Business Acquisition [Line Items]
Current assets, net of cash acquired					$ 5,993
SkipperBuds [Member]
Business Acquisition [Line Items]
Current assets, net of cash acquired	$ 30,615
Cash purchase price and net working capital adjustments, net of cash acquired	$ 30,615