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Derivative Financial Instruments Derivative Financial Instruments (Derivative Instruments at Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Derivatives, Fair Value [Line Items]    
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value   $ 216
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value   1,693
Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value $ 540 44
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 623  
Foreign Currency Cash Flow Hedge Liability at Fair Value 2,352 $ 1,477
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value 1,995  
Foreign Exchange Forward [Member] | Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value 1,128  
Foreign Exchange Forward [Member] | Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value 35  
Foreign Exchange Forward [Member] | Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Liability at Fair Value 4,329  
Foreign Exchange Forward [Member] | Other Noncurrent Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Liability at Fair Value $ 18