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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Amounts of gains and losses on the derivative instruments        
Amount of Gain (Loss) Deferred as a Component of Accumulated Other Comprehensive Loss $ (1,059) $ 2,380 $ (3,426) $ 1,437
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold 1,969 (132) 1,639 (358)
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 (1,059) 2,380 (3,426) 1,437
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold $ 1,969 $ (132) $ 1,639 $ (358)