Summary of Significant Accounting Policies - Product Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Product Warranties:
Balance, beginning of year	$ 7,700	$ 7,083	$ 6,472
Provision for warranty	17,470	15,771	14,175
Costs charged to accrual	(17,245)	(14,950)	(13,950)
Change in estimated liability for pre-existing warranties	(2,109)	(204)	386
Balance, end of year	$ 5,816	$ 7,700	$ 7,083
Minimum
Product Warranty [Line Items]
Product warranty period	15 months
Maximum
Product Warranty [Line Items]
Product warranty period	39 months