CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 30, 2014	Mar. 31, 2013	Apr. 01, 2012
Income Statement [Abstract]
Revenues	$ 484,779	$ 484,452	$ 526,696
Cost of revenues	211,877	214,728	246,190
Gross profit	272,902	269,724	280,506
Operating expenses:
Research and development	140,799	159,471	158,749
Selling, general and administrative	101,148	117,648	100,277
Total operating expenses	241,947	277,119	259,026
Operating income (loss)	30,955	(7,395)	21,480
Gain on divestitures, net	78,632	7,986	20,656
Other-than-temporary impairment loss on investments	0	(1,708)	(2,797)
Interest income (expense) and other, net	2,707	1,708	(1,118)
Income before income taxes from continuing operations	112,294	591	38,221
Income tax expense (benefit)	981	(2,120)	268
Net income from continuing operations	111,313	2,711	37,953
Discontinued operations:
Gain from divestiture	0	886	45,939
Loss from discontinued operations before income taxes	(22,938)	(23,653)	(25,521)
Income tax expense (benefit)	11	116	(89)
Net income (loss) from discontinued operations	(22,949)	(22,883)	20,507
Net income (loss)	$ 88,364	$ (20,172)	$ 58,460
Basic net income per share - continuing operations (in dollars per share)	$ 0.74	$ 0.02	$ 0.26
Basic net income (loss) per share - discontinued operations (in dollars per share)	$ (0.15)	$ (0.16)	$ 0.15
Basic net income per share (in dollars per share)	$ 0.59	$ (0.14)	$ 0.41
Diluted net income per share - continuing operations (in dollars per share)	$ 0.73	$ 0.02	$ 0.26
Diluted net income (loss) per share - discontinued operations (in dollars per share)	$ (0.15)	$ (0.16)	$ 0.14
Diluted net income per share (in dollars per share)	$ 0.58	$ (0.14)	$ 0.40
Weighted average shares:
Basic (shares)	149,480	144,014	143,958
Diluted (shares)	153,369	145,678	145,848