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Derivative Financial Instruments (Gains and Losses on Derivative Instruments) (Details) - Designated as hedging instruments: - Cash flow hedges - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ (8,499) $ 2,928 $ (2,432)
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ 5,808 $ (1,670) $ (3,296)