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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Changes in provision for warranties    
Warranty provision at beginning of period $ 20,825 $ 21,724
Additions and adjustments 930 2,254
Reductions for warranty repair costs (1,180) (2,291)
Warranty provision at end of period $ 20,575 $ 21,687