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Fair Value Measurements - Additional Information (Details) - USD ($)	Sep. 30, 2023	Sep. 30, 2022
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
Contingent consideration liabilities	$ 80,700,000	$ 6,400,000

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

- Definition

Amount of liability recognized arising from contingent consideration in a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479581/805-30-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479668/805-30-25-6

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 35
-Paragraph 1
-Subparagraph (b)
-SubTopic 30
-Topic 805
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479613/805-30-35-1

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

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- References

No definition available.

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