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Foreign Currency Transactions and Derivatives (Details) (USD $)
3 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Mar. 31, 2013
Foreign Currency Transactions and Derivatives [Abstract]        
Foreign currency net gains or (losses) resulting from assets and liabilities denominated in non-local currency and current inter-company balances $ (544,000) $ 737,000    
Hedging transaction net (loss) from foreign exchange derivative contracts 10,000 (213,000)    
Derivative, maturity date Jul. 31, 2013   Apr. 30, 2012  
Amount of derivative contracts maturing 3,200,000     1,800,000
Amount of derivative contracts to purchase $ 23,800,000     $ 15,500,000