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Accounts Receivable - Accounts Receivable, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Receivables [Abstract]
Trade receivables, net	$ 81,873	$ 84,120
Amounts due from manufacturers	23,903	19,937
Other receivables	2,512	2,352
Accounts receivable, net	$ 108,288	$ 106,409

X

- Definition

Receivables from manufacturers.

+ References

No definition available.

+ Details

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Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Trade receivables net.

+ References

No definition available.

+ Details

Name:	hzo_TradeReceivablesNet
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherReceivablesNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration