XML 65 R47.htm IDEA: XBRL DOCUMENT v3.10.0.1

Goodwill and Other Assets - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Feb. 28, 2006	Sep. 30, 2018	Sep. 30, 2017
Schedule Of Goodwill And Other Assets [Line Items]
Goodwill		$ 27.4	$ 25.9
Corporate Joint Venture [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Acquired certain real estate and assets	$ 4.0
Great American Marina [Member] | Corporate Joint Venture [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Acquired certain real estate and assets	11.0
Brunswick's Contribution [Member] | Corporate Joint Venture [Member]
Schedule Of Goodwill And Other Assets [Line Items]
Acquired certain real estate and assets	$ 7.0

X

- Definition

Schedule of goodwill and other assets.

+ References

No definition available.

+ Details

Name:	hzo_ScheduleOfGoodwillAndOtherAssetsLineItems
Namespace Prefix:	hzo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6613-128477

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109124213&loc=d3e6578-128477

+ Details

Name:	us-gaap_BusinessCombinationConsiderationTransferred1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

+ Details

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=us-gaap_CorporateJointVentureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=hzo_GreatAmericanMarinaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=hzo_BrunswickMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: