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Accounts Receivable - Additional Information (Detail) | 12 Months Ended
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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

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration