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Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Movement in Standard Product Warranty Accrual [Roll Forward]        
Beginning balance $ 9,204 $ 7,176 $ 8,083 $ 6,610
Add: Warranty expense 2,222 1,447 5,863 3,990
Less: Warranty claims paid (1,244) (880) (3,764) (2,857)
Ending balance $ 10,182 $ 7,743 $ 10,182 $ 7,743