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Derivative Financial Instruments (Derivative Instruments at Fair Value) (Details) - Foreign Exchange Forward [Member] - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value $ 440 $ 540
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 2,449 623
Foreign Currency Cash Flow Hedge Liability at Fair Value 0 2,352
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 3,419 1,995
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value 2,889 1,128
Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value 0 35
Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Liability at Fair Value 3,419 4,329
Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Liability at Fair Value $ 0 $ 18