Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Apr. 01, 2012
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (18,266)	$ 73,136	$ 229,436
Changes in fair value of marketable securities:
Changes in unrealized gains	(1,112)	1,600	691
Net realized gains reclassified into earnings	(587)	(626)	(204)
Total changes in fair value of marketable securities	(1,699)	974	487
Foreign currency translation adjustments	247	(120)	(68)
Total other comprehensive income (loss)	(1,452)	854	419
Comprehensive income (loss)	$ (19,718)	$ 73,990	$ 229,855