Balance Sheet Components (Allowance for Product Returns) (Details) - Allowance for Product Returns [Member] - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 7,296	$ 3,123	$ 8,201
Additions	38,103	31,034	23,153
Deductions	(34,133)	(26,861)	(28,231)
Balance at end of period	$ 11,266	$ 7,296	$ 3,123