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Derivative Financial Instruments Derivative Financial Instruments (Derivative Instruments at Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Asset at Fair Value $ 44 $ 0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 216 507
Other Current Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Foreign Currency Cash Flow Hedge Liability at Fair Value 1,477 0
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 1,693 $ 46