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Revenue Recognition - Summary of Percentage on Timing of Revenue Recognition (Details) | 3 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Retail Operations [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 100.00% | 100.00%
Product Manufacturing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 100.00% |
Goods and Services Transferred at a Point in Time [Member] | Retail Operations [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 89.50% | 90.50%
Goods and Services Transferred at a Point in Time [Member] | Product Manufacturing [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 100.00% |
Goods and Services Transferred Over Time [Member] | Retail Operations [Member] |  |
Disaggregation Of Revenue [Line Items] |  |
Revenue | 10.50% | 9.50%

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- Definition Revenue from contract with customer, percentage. + References No definition available. + Details
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Namespace Prefix: | hzo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- 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

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hzo_RetailOperationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=hzo_ProductManufacturingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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