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Segment Reporting (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Net sales	$ 138,659	$ 140,429	$ 114,373	$ 103,541	$ 75,106	$ 77,149	$ 67,661	$ 62,021	$ 497,002	$ 281,937	$ 252,965
Depreciation and amortization									12,854	6,748	5,524
Net income before provision for income taxes									89,387	48,668	32,096
Capital expenditures									10,449	9,262	6,176
Long-lived assets	167,296				46,412				167,296	46,412	41,986
Total assets	365,768				223,663				365,768	223,663	222,326
Malibu US
Segment Reporting Information [Line Items]
Net sales									293,242	258,942	232,116
Depreciation and amortization									6,859	6,115	4,900
Net income before provision for income taxes									68,015	46,927	31,674
Capital expenditures									9,248	9,183	6,156
Long-lived assets	39,388				36,089				39,388	36,089	31,446
Total assets	327,181				222,252				327,181	222,252	222,613
Cobalt
Segment Reporting Information [Line Items]
Net sales									180,315	0	0
Depreciation and amortization									5,386	0	0
Net income before provision for income taxes									19,717	0	0
Capital expenditures									1,170	0
Long-lived assets	118,512				0				118,512	0	0
Total assets	157,616				0				157,616	0	0
Malibu Australia
Segment Reporting Information [Line Items]
Net sales									23,445	22,995	20,849
Depreciation and amortization									609	633	624
Net income before provision for income taxes									1,770	1,893	453
Capital expenditures									31	79	20
Long-lived assets	9,396				10,323				9,396	10,323	10,540
Total assets	20,128				19,099				20,128	19,099	17,130
Operating Segments
Segment Reporting Information [Line Items]
Net sales									497,002	281,937	252,965
Operating Segments | Malibu US
Segment Reporting Information [Line Items]
Net sales									302,115	267,552	239,689
Operating Segments | Cobalt
Segment Reporting Information [Line Items]
Net sales									180,315	0	0
Operating Segments | Malibu Australia
Segment Reporting Information [Line Items]
Net sales									23,445	22,995	20,849
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net sales									(8,873)	(8,610)	(7,573)
Net income before provision for income taxes									(115)	(152)	(31)
Total assets	$ (139,157)				$ (17,688)				(139,157)	(17,688)	(17,417)
Intersegment Eliminations | Malibu US
Segment Reporting Information [Line Items]
Net sales									8,873	8,610	7,573
Intersegment Eliminations | Cobalt
Segment Reporting Information [Line Items]
Net sales									0	0	0
Intersegment Eliminations | Malibu Australia
Segment Reporting Information [Line Items]
Net sales									$ 0	$ 0	$ 0

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