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Derivative Financial Instruments (Gains and Losses on Derivative Instruments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ (4,071) $ 205 $ 1,781
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold 8,043 (813) 1,810
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 (4,071) 205 1,781
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ 8,043 $ (813) $ 1,810