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Segment Information (Details) $ in Thousands	3 Months Ended
Segment Information (Details) $ in Thousands	Sep. 30, 2019 USD ($) segment	Sep. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)
Segment Reporting Information [Line Items]
Net sales	$ 172,080	$ 123,483
Income before provision for income taxes	21,526	15,598
Assets	$ 479,805		$ 451,314
Malibu U.S., Malibu Australia, Cobalt and Pursuit
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	4
Malibu U.S. And Malibu Australia
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	1
Malibu
Segment Reporting Information [Line Items]
Net sales	$ 85,880	75,223
Income before provision for income taxes	11,461	8,751
Cobalt
Segment Reporting Information [Line Items]
Net sales	50,151	48,260
Income before provision for income taxes	5,907	6,847
Pursuit
Segment Reporting Information [Line Items]
Net sales	36,049	0
Income before provision for income taxes	$ 4,158	0
Malibu, Cobalt And Pursuit
Segment Reporting Information [Line Items]
Number of reportable segments \| segment	3
Operating Segments
Segment Reporting Information [Line Items]
Net sales	$ 172,080	123,483
Operating Segments \| Malibu
Segment Reporting Information [Line Items]
Net sales	85,880	75,223
Assets	200,241		185,154
Operating Segments \| Cobalt
Segment Reporting Information [Line Items]
Net sales	50,151	48,260
Assets	159,096		151,481
Operating Segments \| Pursuit
Segment Reporting Information [Line Items]
Net sales	36,049	$ 0
Assets	$ 120,468		$ 114,679