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Derivative Instruments (Narratives) (Details)
$ in Thousands
12 Months Ended
Mar. 31, 2018
USD ($)
Counterparty
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Derivatives, Fair Value [Line Items]      
Number of different counterparties | Counterparty 4    
Reclassify Next Year      
Derivatives, Fair Value [Line Items]      
Amount of accumulated other comprehensive loss expected to be reclassified in the next 12 months $ 10    
Derivatives Designated as Hedging Instruments | Currency Swap [Member]      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency forward agreements designated as cash flow hedges 215,130    
Amount of accumulated other comprehensive loss expected to be reclassified in the next 12 months 132    
Derivatives Designated as Hedging Instruments | Commodity Contract      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency forward agreements designated as cash flow hedges 13,474    
Derivatives Designated as Hedging Instruments | Reclassify Next Year      
Derivatives, Fair Value [Line Items]      
Amount of accumulated other comprehensive loss expected to be reclassified in the next 12 months 503    
Derivatives Designated as Hedging Instruments | Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Notional amount of foreign currency forward agreements designated as cash flow hedges 229,830    
Prepaid expenses and other | Derivatives Not Designated as Hedging Instruments | Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Notional amount of derivatives 3,500    
Cost of Sales [Member] | Derivatives Designated as Hedging Instruments | Foreign Exchange Contract [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (196) $ (40) $ 74
Cost of Sales [Member] | Derivatives Designated as Hedging Instruments | Interest Rate Swap [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   $ (819)