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Accounts Receivable - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2020
Receivables [Abstract]
Receivable Collection Period	30 days

X

- Definition

Receivable collection period.

+ References

No definition available.

+ Details

Name:	hzo_ReceivableCollectionPeriod
Namespace Prefix:	hzo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration