Effects of Foreign Currency Forward Contracts in Cash Flow Hedging Relationships (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 28, 2012	Dec. 30, 2011	Dec. 28, 2012	Dec. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivatives (Effective Portion)	$ 57	$ (243)	$ (463)	$ (880)
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(141)	(112)	(727)	(29)
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign currency forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized in Accumulated OCI on Derivatives (Effective Portion)	57	(243)	(463)	(880)
Derivatives in Cash Flow Hedging Relationships [Member] | Foreign currency forward contracts [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)	$ (141)	$ (112)	$ (727)	$ (29)