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v3.22.2.2

Fair Value Measurements - Additional Information (Details) - USD ($) | Sep. 30, 2022 | Sep. 30, 2021
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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
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration