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Fair Value Measurements - Additional Information (Details) - USD ($)	Sep. 30, 2022	Sep. 30, 2021
Fair Value Disclosures [Abstract]
Fair value, assets, level 1 to level 2 transfers	$ 0	$ 0
Fair value, assets, level 2 to level 1 transfers	0	0
Fair value, assets, level 2 to level 3 transfers	0	0
Fair value, assets, level 3 to level 2 transfers	0	0
Fair value, assets, level 1 to level 3 transfers	0	0
Fair value, assets, level 3 to level 1 transfers	0	0
Fair value, liabilities, level 1 to level 2 transfers	0	0
Fair value, liabilities, level 2 to level 1 transfers	0	0
Fair value, liabilities, level 2 to level 3 transfers	0	0
Fair value, liabilities, level 3 to level 2 transfers	0	0
Fair value, liabilities, level 1 to level 3 transfers	0	0
Fair value, liabilities, level 3 to level 1 transfers	$ 0	$ 0

X

- Definition

Fair value assets level 1 to level 2 transfer amount.

+ References

No definition available.

+ Details

Name:	hzo_FairValueAssetsLevel1ToLevel2TransferAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 3.

+ References

No definition available.

+ Details

Name:	hzo_FairValueAssetsLevel1ToLevel3TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value assets level 2 to level1 transfer amount.

+ References

No definition available.

+ Details

Name:	hzo_FairValueAssetsLevel2ToLevel1TransferAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 3.

+ References

No definition available.

+ Details

Name:	hzo_FairValueAssetsLevel2ToLevel3TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 1.

+ References

No definition available.

+ Details

Name:	hzo_FairValueAssetsLevel3ToLevel1TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of transfers of assets measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 2.

+ References

No definition available.

+ Details

Name:	hzo_FairValueAssetsLevel3ToLevel2TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value liabilities level1 to level2 transfer amount.

+ References

No definition available.

+ Details

Name:	hzo_FairValueLiabilitiesLevel1ToLevel2TransferAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 3.

+ References

No definition available.

+ Details

Name:	hzo_FairValueLiabilitiesLevel1ToLevel3TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value liabilities level 2 to level1 transfer amount.

+ References

No definition available.

+ Details

Name:	hzo_FairValueLiabilitiesLevel2ToLevel1TransferAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 3.

+ References

No definition available.

+ Details

Name:	hzo_FairValueLiabilitiesLevel2ToLevel3TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 1.

+ References

No definition available.

+ Details

Name:	hzo_FairValueLiabilitiesLevel3ToLevel1TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 3 of the fair value hierarchy into Level 2.

+ References

No definition available.

+ Details

Name:	hzo_FairValueLiabilitiesLevel3ToLevel2TransfersAmount
Namespace Prefix:	hzo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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