Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013	Dec. 30, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 20,586	$ 13,241	$ 28,513	$ 43,501
Changes in fair value of marketable securities:
Changes in unrealized gains	(35)	(106)	(1,354)	1,243
Net realized gains reclassified into earnings	(84)	(208)	(343)	(396)
Total changes in fair value of marketable securities	(119)	(314)	(1,697)	847
Foreign currency translation adjustments	101	(71)	59	3
Total other comprehensive income (loss)	(18)	(385)	(1,638)	850
Comprehensive income	$ 20,568	$ 12,856	$ 26,875	$ 44,351