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Property, Plant, and Equipment (Schedule of Depreciation Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Property Plant And Equipment Net [Abstract]        
Depreciation expense $ 22,378 $ 21,665 $ 68,101 $ 62,998