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Supplemental Balance Sheet Information (Components Of Property, Plant And Equipment) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jun. 30, 2019
Supplemental Balance Sheet Information [Abstract]    
Property, plant and equipment, gross $ 903,299 $ 898,975
Accumulated depreciation and amortization (506,090) (511,515)
Property, plant and equipment, net $ 397,209 $ 387,460