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Derivative Financial Instruments - Fair Values of Company Derivative Instruments (Details) - Designated as hedging instruments - Cash Flow Hedges - USD ($)
$ in Thousands
Sep. 30, 2017
Mar. 31, 2017
Other Current Assets    
Derivative Financial Instruments    
Asset $ 165 $ 48
Accrued Liabilities Current    
Derivative Financial Instruments    
Liability $ 38 $ 402