Derivative Instruments (Pretax effect of derivative instruments on the condensed consolidated statement of operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended			3 Months Ended		6 Months Ended
	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Cost of Sales [Member]	Sep. 30, 2012 Foreign Exchange Contract [Member]	Sep. 30, 2012 Foreign Exchange Contract [Member] Cost of Sales [Member]	Sep. 30, 2012 Foreign Exchange Contract [Member] Cost of Sales [Member]
Derivatives, Fair Value [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net		$ (73)	$ 135		$ (68)		$ 24
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion	(5)		63	116
Amount of Gain Recognized in Income on Derivatives	$ 837	$ 534	$ 988			$ (77)