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Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Current:      
Federal $ 39,979 $ 17,872 $ 81,127
State 3,697 1,379 6,067
Foreign 25,968 15,118 9,689
Deferred:      
Federal (10,519) 16,907 (40,801)
State (3,784) (2,561) (9,054)
Foreign (16,141) 3,525 (1,380)
Income tax expense $ 39,200 $ 52,240 $ 45,648