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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Net sales	$ 194,822	$ 199,918	$ 165,793	$ 123,483	$ 138,659	$ 140,429	$ 114,373	$ 103,541	$ 684,016	$ 497,002	$ 281,937
Depreciation and amortization									15,960	12,854	6,748
Net income before provision for income taxes									91,797	89,387	48,668
Capital expenditures									17,938	10,449	9,262
Long-lived assets	263,221				167,296				263,221	167,296	46,412
Total assets	451,314				365,768				451,314	365,768	223,663
Malibu US
Segment Reporting Information [Line Items]
Net sales									348,994	293,242	258,942
Depreciation and amortization									7,127	6,859	6,115
Net income before provision for income taxes									52,804	68,015	46,927
Capital expenditures									9,014	9,248	9,183
Long-lived assets	40,700				39,388				40,700	39,388	36,089
Total assets	363,209				327,181				363,209	327,181	222,252
Cobalt
Segment Reporting Information [Line Items]
Net sales									206,598	180,315	0
Depreciation and amortization									5,252	5,386	0
Net income before provision for income taxes									28,691	19,717	0
Capital expenditures									4,404	1,170
Long-lived assets	117,702				118,512				117,702	118,512	0
Total assets	151,481				157,616				151,481	157,616	0
Pursuit
Segment Reporting Information [Line Items]
Net sales									102,807	0
Depreciation and amortization									3,034	0
Net income before provision for income taxes									8,946	0
Capital expenditures									4,381	0
Long-lived assets	96,312				0				96,312	0
Total assets	114,679				0				114,679	0
Malibu Australia
Segment Reporting Information [Line Items]
Net sales									25,617	23,445	22,995
Depreciation and amortization									547	609	633
Net income before provision for income taxes									1,681	1,770	1,893
Capital expenditures									139	31	79
Long-lived assets	8,507				9,396				8,507	9,396	10,323
Total assets	22,353				20,128				22,353	20,128	19,099
Operating Segments
Segment Reporting Information [Line Items]
Net sales									684,016	497,002	281,937
Operating Segments | Malibu US
Segment Reporting Information [Line Items]
Net sales									362,082	302,115	267,552
Operating Segments | Cobalt
Segment Reporting Information [Line Items]
Net sales									206,598	180,315	0
Operating Segments | Pursuit
Segment Reporting Information [Line Items]
Net sales									102,807	0
Operating Segments | Malibu Australia
Segment Reporting Information [Line Items]
Net sales									25,617	23,445	22,995
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(13,088)	(8,873)	(8,610)
Net income before provision for income taxes									(325)	(115)	(152)
Total assets	$ (200,408)				$ (139,157)				(200,408)	(139,157)	(17,688)
Intersegment Eliminations | Malibu US
Segment Reporting Information [Line Items]
Net sales									13,088	8,873	8,610
Intersegment Eliminations | Cobalt
Segment Reporting Information [Line Items]
Net sales									0	0	0
Intersegment Eliminations | Pursuit
Segment Reporting Information [Line Items]
Net sales									0	0
Intersegment Eliminations | Malibu Australia
Segment Reporting Information [Line Items]
Net sales									$ 0	$ 0	$ 0
Sales Revenue, Net | Customer Concentration | Malibu U.S., Cobalt and Pursuit
Segment Reporting Information [Line Items]
Concentration risk, percentage									15.00%

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