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Derivative Financial Instruments - Gains and Losses on Derivative Instruments (Details) - Designated as hedging instruments - Cash Flow Hedges - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Other Comprehensive Loss        
Amounts of gains and losses on the derivative instruments        
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ (2,140) $ 564 $ (5,349) $ 1,529
Cost of goods sold        
Amounts of gains and losses on the derivative instruments        
Amount of Loss Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ 2,596 $ 155 $ 3,129 $ 895