Financial Risk Management and Derivatives (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Forward foreign currency exchange contracts included in other current liabilities	$ 1,542,000		$ 1,542,000		$ 1,193,000
Forward Foreign Currency Exchange Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Notional amount of foreign currency derivatives	19,484,000		19,484,000		$ 19,356,000
Forward Foreign Currency Exchange Contracts [Member] | General and Administrative Expenses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Forward foreign currency exchange contracts	$ (527,000)	$ (361,000)	$ (349,000)	$ (128,000)