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Significant Accounting Policies - Summary of Percentage on Timing of Revenue Recognition (Details)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Total Revenue	100.00%	100.00%
Goods and Services Transferred at a Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	92.70%	90.80%
Goods and Services Transferred Over Time [Member]
Disaggregation Of Revenue [Line Items]
Total Revenue	7.30%	9.20%

X

- Definition

Revenue from contract with customer, percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	hzo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredAtPointInTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TimingOfTransferOfGoodOrServiceAxis=us-gaap_TransferredOverTimeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: