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Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Current:      
Federal $ 15,976 $ 40,173 $ 39,979
State 1,383 2,402 3,697
Foreign 22,588 34,660 25,968
Deferred:      
Federal 10,784 (2,015) (10,519)
State (547) (2,948) (3,784)
Foreign (8,698) (11,262) (16,141)
Income tax expense $ 41,486 $ 61,010 $ 39,200