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Fair Value Measurements- Gains and Losses on Derivative Instruments (Details) - Designated as hedging instruments - Cash Flow Hedges - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Amounts of gains and losses on the derivative instruments        
Amount of
Gain (Loss) Deferred as 
a Component of 
Accumulated Other 
Comprehensive Loss After Reclassification to Costs of Goods Sold $ 1,060 $ 3,290 $ (3,662) $ 3,938
Cost of goods sold        
Amounts of gains and losses on the derivative instruments        
Amount of Loss (Gain) Reclassified from Accumulated Other Comprehensive Loss to Costs of Goods Sold (28) (215) (2,488) 185
Other Income (Expense), Net        
Amounts of gains and losses on the derivative instruments        
Amount of Gain (Loss) Immediately Recognized in Other Expense, Net $ 75 $ (1) $ 143 $ (56)