Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 28, 2014	Jun. 29, 2013
Income Statement [Abstract]
Revenue	$ 316,321	$ 292,996
Cost of goods sold	174,052	199,527
Gross profit	142,269	93,469
Operating expenses:
Research and development	44,586	48,325
Marketing and selling	18,890	19,409
General and administrative	19,065	19,492
Other operating expense (Note 9)	13,608	3,008
Total operating expenses	96,149	90,234
Income from operations	46,120	3,235
Interest expense	(474)	(1,509)
Interest income	35	41
Other income, net	384	408
Income before income taxes	46,065	2,175
Income tax expense (Note 5)	(7,418)	(614)
Net income	$ 38,647	$ 1,561
Net income per share (Note 2):
Basic (in dollars per share)	$ 0.14	$ 0.01
Diluted (in dollars per share)	$ 0.13	$ 0.01
Shares used in per share calculation:
Basic (in shares)	286,257	280,788
Diluted (in shares)	294,637	287,105