CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 28, 2014	Dec. 29, 2013	Dec. 28, 2014	Dec. 29, 2013
Income Statement [Abstract]
Revenues	$ 151,160	$ 124,628	$ 414,555	$ 366,139
Cost of revenues	59,796	49,689	167,306	154,317
Gross profit	91,364	74,939	247,249	211,822
Operating expenses:
Research and development	32,825	31,063	95,617	107,939
Selling, general and administrative	27,165	23,687	79,419	77,826
Total operating expenses	59,990	54,750	175,036	185,765
Operating income	31,374	20,189	72,213	26,057
Loss (gain) from divestiture	0	(3,415)	0	78,934
Interest income and other, net	1,558	1,108	2,825	1,921
Income before income taxes from continuing operations	32,932	17,882	75,038	106,912
Income tax provision	91	543	840	661
Net income from continuing operations	32,841	17,339	74,198	106,251
Discontinued operations:
Gain from divestiture before income taxes	0	0	16,840	0
Loss from discontinued operations before income taxes	(14,538)	(10,123)	(36,438)	(17,922)
Income tax provision (benefit)	(55)	268	(43)	(6)
Net loss from discontinued operations	(14,483)	(10,391)	(19,555)	(17,916)
Net income	$ 18,358	$ 6,948	$ 54,643	$ 88,335
Basic net income per share - continuing operations (in dollars per share)	$ 0.22	$ 0.11	$ 0.50	$ 0.71
Basic net income (loss) per share - discontinued operations (in dollars per share)	$ (0.10)	$ (0.06)	$ (0.13)	$ (0.12)
Basic net income (loss) per share (in dollars per share)	$ 0.12	$ 0.05	$ 0.37	$ 0.59
Diluted net income per share - continuing operations (in dollars per share)	$ 0.21	$ 0.11	$ 0.48	$ 0.70
Diluted net income (loss) per share - discontinued operations (in dollars per share)	$ (0.09)	$ (0.07)	$ (0.12)	$ (0.12)
Diluted net income (loss) per share (in dollars per share)	$ 0.12	$ 0.04	$ 0.36	$ 0.58
Weighted average shares:
Basic (shares)	148,552	151,018	148,844	148,835
Diluted (shares)	153,973	155,035	153,904	152,560