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v3.20.2

Significant Accounting Policies - Summary of Percentage on Timing of Revenue Recognition (Details) | 12 Months Ended
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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%

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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: | num: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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |