CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 28, 2015	Jun. 29, 2014
Income Statement [Abstract]
Revenues	$ 160,907	$ 126,302
Cost of revenues	61,673	52,293
Gross profit	99,234	74,009
Operating expenses:
Research and development	33,754	32,050
Selling, general and administrative	28,143	25,459
Total operating expenses	61,897	57,509
Operating income	37,337	16,500
Interest income and other, net	1,818	862
Income before income taxes from continuing operations	39,155	17,362
Income tax provision	435	251
Net income from continuing operations	38,720	17,111
Discontinued operations:
Gain from divestiture before income taxes	0	16,840
Loss from discontinued operations before income taxes	(547)	(12,153)
Income tax provision (benefit)	15	(45)
Net income (loss) from discontinued operations	(562)	4,732
Net income	$ 38,158	$ 21,843
Basic net income per share - continuing operations (in dollars per share)	$ 0.26	$ 0.11
Basic net income (loss) per share - discontinued operations (in dollars per share)	0.00	0.04
Basic net income (loss) per share (in dollars per share)	0.26	0.15
Diluted net income per share - continuing operations (in dollars per share)	0.25	0.11
Diluted net income (loss) per share - discontinued operations (in dollars per share)	0.00	0.03
Diluted net income (loss) per share (in dollars per share)	$ 0.25	$ 0.14
Weighted average shares:
Basic (shares)	148,396	149,283
Diluted (shares)	153,758	153,741