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Derivative Financial Instruments - Gains and Losses on Derivative Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Amounts of gains and losses on the derivative instruments        
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ 298 $ (2,140) $ 485 $ (5,349)
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold 218 2,596 3,069 3,129
Designated as hedging instruments | Cash Flow Hedges        
Amounts of gains and losses on the derivative instruments        
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss 298 (2,140) 485 (5,349)
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ 218 $ 2,596 $ 3,069 $ 3,129