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Financial Instruments (Details 3) (USD $)
3 Months Ended 9 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Financial Instruments          
Trading Securities, Fair Value Disclosure $ 16,439,000   $ 16,439,000   $ 15,599,000
Trading Securities, Change in Unrealized Holding Gain (Loss) 400,000 (100,000) 200,000 100,000  
Derivative Financial Instruments          
Asset Derivatives, Fair Value 719,000   719,000   1,197,000
Liability Derivatives, Fair Value 1,099,000   1,099,000   707,000
Designated as hedging instruments: | Cash Flow Hedges
         
Derivative Financial Instruments          
Asset Derivatives, Fair Value 5,000   5,000   1,165,000
Liability Derivatives, Fair Value 894,000   894,000    
Not designated as hedging instruments:
         
Derivative Financial Instruments          
Asset Derivatives, Fair Value 714,000   714,000   32,000
Liability Derivatives, Fair Value 205,000   205,000   707,000
Not designated as hedging instruments: | Foreign exchange forward contract
         
Derivative Financial Instruments          
Liability Derivatives, Fair Value 184,000   184,000   270,000
Not designated as hedging instruments: | Foreign exchange swap contract
         
Derivative Financial Instruments          
Asset Derivatives, Fair Value 714,000   714,000   32,000
Liability Derivatives, Fair Value $ 21,000   $ 21,000   $ 437,000