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Financial Risk Management and Derivatives (Details) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2012
Forward Foreign Currency Exchange Contracts [Member]
General and Administrative Expenses [Member]
Dec. 31, 2011
Forward Foreign Currency Exchange Contracts [Member]
General and Administrative Expenses [Member]
Dec. 31, 2012
Forward Foreign Currency Exchange Contracts [Member]
General and Administrative Expenses [Member]
Dec. 31, 2011
Forward Foreign Currency Exchange Contracts [Member]
General and Administrative Expenses [Member]
Financial Risk Management and Derivatives [Abstract]            
Notional amount of foreign currency derivatives $ 16,708,000 $ 13,494,000        
Derivative Instruments, Gain (Loss) [Line Items]            
Forward foreign currency exchange contracts     20,000 488,000 360,000 (1,399,000)
Forward foreign currency exchange contracts included in prepaid expenses and other current assets 239,000          
Forward foreign currency exchange contracts included in other current liabilities   $ 121,000