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Goodwill - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Sep. 30, 2019
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Goodwill And Other Assets Disclosure [Abstract] |  |
Goodwill and other intangible assets | $ 65,139 | $ 64,077

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- Definition Goodwill and other assets disclosure. + References No definition available. + Details
Name: | hzo_GoodwillAndOtherAssetsDisclosureAbstract
Namespace Prefix: | hzo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
Name: | us-gaap_IntangibleAssetsNetIncludingGoodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant