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Company Background - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2014 Location Store
Product Information [Line Items]
Number of retail locations				54us-gaap_NumberOfStores
Number of states wherein retail locations are established				17us-gaap_NumberOfStatesInWhichEntityOperates
Azimut Yachts [Member] | Sales [Member]
Product Information [Line Items]
Revenue percentage from sale of boats	14.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = hzo_AzimutYachtsMember
New Boat Sales [Member] | Brunswick's Contribution [Member] | Sales [Member]
Product Information [Line Items]
Revenue percentage from sale of boats	40.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = hzo_NewBoatSalesMember / dei_LegalEntityAxis = hzo_BrunswickMember
Supplier Concentration Risk [Member] | Brunswick's Contribution [Member] | Sales [Member]
Product Information [Line Items]
Revenue percentage from sale of boats	43.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_SupplierConcentrationRiskMember / dei_LegalEntityAxis = hzo_BrunswickMember
Geographic Concentration Risk [Member] | Florida [Member] | Sales [Member]
Product Information [Line Items]
Revenue percentage from sale of boats	52.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_FL	51.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_FL	49.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = stpr_FL
Brunswick Sea Ray Boat [Member] | Brunswick's Contribution [Member] | Sales [Member]
Product Information [Line Items]
Revenue percentage from sale of boats	26.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = hzo_BrunswickSeaRayBoatMember / dei_LegalEntityAxis = hzo_BrunswickMember
Brunswick Boston Whaler Boats [Member] | Brunswick's Contribution [Member] | Sales [Member]
Product Information [Line Items]
Revenue percentage from sale of boats	10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = hzo_BrunswickBostonWhalerBoatsMember / dei_LegalEntityAxis = hzo_BrunswickMember

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

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- Definition

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+ References

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- Definition

Represents the number of stores.

+ References

No definition available.

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