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Commitments and Contingencies - Product Warranties (Details) - USD ($)
$ in Thousands
6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in provision for warranties    
Warranty provision at beginning of period $ 21,724 $ 21,819
Additions and adjustments 4,759 3,975
Reductions for warranty repair costs (4,757) (3,842)
Warranty provision at end of period $ 21,726 $ 21,952