XML 47 R34.htm IDEA: XBRL DOCUMENT
v3.21.1

Basis of Presentation - Additional Information (Detail) | 6 Months Ended
--- | ---
Mar. 31, 2021 Dealer Operations
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Recreational boat dealers | Dealer | 30
Boat brokerage operations | 4
Full-service yacht repair operations | 2

X
- Definition Boat brokerage operations number. + References No definition available. + Details
Name: | hzo_BoatBrokerageOperationsNumber
Namespace Prefix: | hzo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Full service yacht repair operations number. + References No definition available. + Details
Name: | hzo_FullServiceYachtRepairOperationsNumber
Namespace Prefix: | hzo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Recreational boat dealers in number. + References No definition available. + Details
Name: | hzo_RecreationalBoatDealersInNumber
Namespace Prefix: | hzo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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