Basis of Presentation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Dec. 30, 2011	Dec. 31, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in Accumulated OCI on derivatives (effective portion)	$ (243)	$ (120)	$ (880)	$ 160
Amount of gain or (loss) reclassified from accumulated OCI into income (effective portion)	(112)	399	(29)	601
Foreign currency forward contracts [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) recognized in Accumulated OCI on derivatives (effective portion)	(243)	(120)	(880)	160
Foreign currency forward contracts [Member] | Cash Flow Hedging [Member] | Cost of product revenues [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain or (loss) reclassified from accumulated OCI into income (effective portion)	$ (112)	$ 399	$ (29)	$ 601