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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands			12 Months Ended
	Aug. 22, 2018	Aug. 21, 2018	Jun. 30, 2018	Jun. 30, 2017	Aug. 20, 2018
Subsequent Event [Line Items]
Options granted (in shares)			40,000	104,000
Options granted (in dollars per share)			$ 30.87	$ 25.85
Pursuit Boats \| Subsequent Event
Subsequent Event [Line Items]
Fair value of total consideration transferred		$ 100,000
Revolving Credit \| Amended Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Increase in credit facility		50,000
Remaining borrowing capacity		$ 85,000			$ 35,000
Percentage of ticking fee per annum		0.30%
Employee Stock Option \| Class A Common Stock \| Subsequent Event
Subsequent Event [Line Items]
Options granted (in shares)	50,000
Options granted (in dollars per share)	$ 42.13
Award vesting period	4 years