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Derivative Financial Instruments (Gains and Losses on Derivative Instruments) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ 1,781    
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss   $ (8,499) $ 2,928
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold 1,810    
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold   5,808 (1,670)
Designated as hedging instruments | Cash flow hedges      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss 1,781    
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss   (8,499) 2,928
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ 1,810    
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold   $ 5,808 $ (1,670)