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Summary of Significant Accounting Policies (Allowance for Product Returns) (Details) - Allowance for Product Returns [Member] - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 1,609 $ 1,080 $ 2,700
Additions 3,658 3,478 3,306
Deductions (4,725) (2,949) (4,926)
Balance at end of period $ 542 $ 1,609 $ 1,080