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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Changes in provision for warranties    
Warranty provision at beginning of period $ 15,178 $ 15,948
Additions and adjustments 10,431 6,514
Reductions for warranty repair costs (5,219) (4,395)
Warranty provision at end of period $ 20,390 $ 18,067