CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 29, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenues	$ 126,302	$ 117,464
Cost of revenues	52,293	51,342
Gross profit	74,009	66,122
Operating expenses:
Research and development	32,050	37,939
Selling, general and administrative	25,459	26,838
Total operating expenses	57,509	64,777
Operating income	16,500	1,345
Interest income and other, net	862	57
Income before income taxes from continuing operations	17,362	1,402
Income tax provision (benefit)	251	(99)
Net income from continuing operations	17,111	1,501
Discontinued operations:
Gain from divestiture before income taxes	16,840	0
Loss from discontinued operations before income taxes	(12,153)	(3,864)
Income tax benefit	(45)	(99)
Net income (loss) from discontinued operations	4,732	(3,765)
Net income (loss)	$ 21,843	$ (2,264)
Basic net income per share - continuing operations (in dollars per share)	$ 0.11	$ 0.01
Basic net income (loss) per share - discontinued operations (in dollars per share)	$ 0.04	$ (0.03)
Basic net income (loss) per share (in dollars per share)	$ 0.15	$ (0.02)
Diluted net income per share - continuing operations (in dollars per share)	$ 0.11	$ 0.01
Diluted net income (loss) per share - discontinued operations (in dollars per share)	$ 0.03	$ (0.03)
Diluted net income (loss) per share (in dollars per share)	$ 0.14	$ (0.02)
Weighted average shares:
Basic (shares)	149,283	147,056
Diluted (shares)	153,741	150,241