XML 97 R78.htm IDEA: XBRL DOCUMENT
v3.20.2

Employee 401(k) Profit Sharing Plans - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract] |  |  |
Duration of profit sharing plan | 90 days |  |
Introductory period of profit sharing | April 1 or October 1 |  |
Employees eligibility age for participating in profit sharing plan | 21 years |  |
Total participants contributions in Profit sharing plan | 50.00% |  |
Maximum of each participants compensation | 5.00% |  |
Contribution under the Profit sharing plan | $ 2.7 | $ 2.3 | $ 1.9

X
- Definition Duration of profit sharing plan. + References No definition available. + Details
Name: | hzo_DurationOfProfitSharingPlan
Namespace Prefix: | hzo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Employees eligibility age for participating in profit sharing plan. + References No definition available. + Details
Name: | hzo_EmployeesEligibilityAgeForParticipatingInProfitSharingPlan
Namespace Prefix: | hzo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Introductory period of profit sharing plan. + References No definition available. + Details
Name: | hzo_IntroductoryPeriodOfProfitSharingPlan
Namespace Prefix: | hzo_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
Name: | us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration