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Derivative Instruments and Hedging Activities - Non-designated Cash Flow Hedges (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Derivatives Not Designated as Hedging Instruments    
Total derivatives not designated as hedging instruments, Asset   $ 322
Total derivatives not designated as hedging instruments, Liability $ 272 58
Other current assets    
Derivatives Not Designated as Hedging Instruments    
Foreign Exchange Contracts, Asset   322
Accrued liabilities    
Credit-risk-related Contingent Features    
Foreign Exchange Contracts, Liability $ 272 $ 58