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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Changes in provision for warranties    
Warranty provision at beginning of period $ 21,724 $ 21,819
Additions and adjustments 6,105 7,135
Reductions for warranty repair costs (6,557) (6,545)
Warranty provision at end of period $ 21,272 $ 22,409