Financial Risk Management and Derivatives (Details) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Financial Risk Management and Derivatives [Abstract]
Notional amount of foreign currency derivatives	$ 17,543,000	$ 13,494,000
Derivative Instruments, Gain (Loss) [Line Items]
Forward foreign currency exchange contracts included in other current liabilities	683,000
Forward foreign currency exchange contracts included in prepaid expenses and other current assets		121,000
Forward Foreign Currency Exchange Contracts [Member] | General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Forward foreign currency exchange contracts	$ 804,000	$ (476,000)	$ (162,000)