CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 03, 2016	Dec. 28, 2014	Jan. 03, 2016	Dec. 28, 2014
Income Statement [Abstract]
Revenues	$ 177,610	$ 151,160	$ 508,015	$ 414,555
Cost of revenues	69,699	59,796	194,324	167,306
Gross profit	107,911	91,364	313,691	247,249
Operating expenses:
Research and development	38,429	32,825	107,484	95,617
Selling, general and administrative	38,851	27,165	96,221	79,419
Total operating expenses	77,280	59,990	203,705	175,036
Operating income	30,631	31,374	109,986	72,213
Interest income (expense) and other, net	(2,008)	1,558	826	2,825
Income before income taxes from continuing operations	28,623	32,932	110,812	75,038
Income tax provision (benefit)	(3,922)	91	(2,876)	840
Net income from continuing operations	32,545	32,841	113,688	74,198
Discontinued operations:
Gain from divestiture before income taxes	0	0	0	16,840
Loss from discontinued operations before income taxes	0	(14,538)	(547)	(36,438)
Income tax provision (benefit)	0	(55)	15	(43)
Net loss from discontinued operations	0	(14,483)	(562)	(19,555)
Net income	$ 32,545	$ 18,358	$ 113,126	$ 54,643
Basic net income per share - continuing operations (in dollars per share)	$ 0.23	$ 0.22	$ 0.78	$ 0.50
Basic net income (loss) per share - discontinued operations (in dollars per share)	0.00	(0.10)	0.00	(0.13)
Basic net income per share (in dollars per share)	0.23	0.12	0.78	0.37
Diluted net income per share - continuing operations (in dollars per share)	0.22	0.21	0.75	0.48
Diluted net loss per share - discontinued operations (in dollars per share)	0.00	(0.09)	0.00	(0.12)
Diluted net income per share (in dollars per share)	$ 0.22	$ 0.12	$ 0.75	$ 0.36
Weighted average shares:
Basic (shares)	140,411	148,552	145,382	148,844
Diluted (shares)	145,705	153,973	150,614	153,904