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Goodwill - Additional Information (Detail) - USD ($) $ in Millions	Mar. 31, 2025	Sep. 30, 2024
Goodwill And Other Assets Disclosure [Abstract]
Goodwill and other intangible assets, net	$ 628.7	$ 629.8

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- Definition

Goodwill and other assets disclosure.

+ References

No definition available.

+ Details

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Namespace Prefix:	hzo_
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- Definition

Amount, after impairment and amortization, of goodwill, indefinite-lived, and finite-lived intangible assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480265/350-10-S45-1

+ Details

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Balance Type:	debit
Period Type:	instant