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Accounts Receivable - Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
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Receivables [Abstract] |  |
Trade receivables, net | $ 84,120 | $ 70,752
Amounts due from manufacturers | 19,937 | 13,555
Other receivables | 2,352 | 1,473
Accounts receivable, net | $ 106,409 | $ 85,780

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- Definition Receivables from manufacturers. + References No definition available. + Details
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Namespace Prefix: | hzo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Trade receivables net. + References No definition available. + Details
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Namespace Prefix: | hzo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration