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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		5 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Net Sales	$ 64,762us-gaap_SalesRevenueGoodsNet	$ 50,293us-gaap_SalesRevenueGoodsNet	$ 167,905us-gaap_SalesRevenueGoodsNet	$ 137,535us-gaap_SalesRevenueGoodsNet
Net income (loss) before provision for income taxes	11,057us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(911)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	21,204us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	9,488us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Long-lived assets	41,820us-gaap_NoncurrentAssets		41,820us-gaap_NoncurrentAssets		41,820us-gaap_NoncurrentAssets
Total assets	140,234us-gaap_Assets		140,234us-gaap_Assets		140,234us-gaap_Assets	84,801us-gaap_Assets
US [Member]
Segment Reporting Information [Line Items]
Net Sales	59,475us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		158,262us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember
Net income (loss) before provision for income taxes	10,791us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		21,481us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember
Long-lived assets	30,064us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		30,064us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		30,064us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember
Total assets	139,806us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		139,806us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		139,806us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember
Australia Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	5,287us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember		9,643us-gaap_SalesRevenueGoodsNet / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember
Net income (loss) before provision for income taxes	541us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember		333us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember
Long-lived assets	11,756us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember		11,756us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember		11,756us-gaap_NoncurrentAssets / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember
Total assets	19,108us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember		19,108us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember		19,108us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember
Operating Segments [Member] | US [Member]
Segment Reporting Information [Line Items]
Net Sales	61,283us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		162,032us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember
Operating Segments [Member] | Australia Segment [Member]
Segment Reporting Information [Line Items]
Net Sales	5,287us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember				9,643us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = mbuu_AustraliaSegmentMember
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net Sales	(1,808)us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember		(3,770)us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Net income (loss) before provision for income taxes	(275)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember		(610)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Total assets	(18,680)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember		(18,680)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember		(18,680)us-gaap_Assets / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember
Intersegment Eliminations [Member] | US [Member]
Segment Reporting Information [Line Items]
Net Sales	$ 1,808us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember		$ 3,770us-gaap_SalesRevenueGoodsNet / us-gaap_ConsolidationItemsAxis = us-gaap_IntersegmentEliminationMember / us-gaap_StatementBusinessSegmentsAxis = mbuu_USsegmentMember

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