Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 01, 2012	Apr. 03, 2011	Mar. 28, 2010
Consolidated Statements of Income [Abstract]
Net revenues	$ 558,608	$ 558,375	$ 518,471
Cost of revenues	177,704	176,959	167,107
Gross profit	380,904	381,416	351,364
Operating expenses:
Engineering and development	138,768	125,219	116,789
Sales and marketing	77,370	73,965	68,881
General and administrative	35,299	34,148	34,242
Special charges		373	5,163
Total operating expenses	251,437	233,705	225,075
Operating income	129,467	147,711	126,289
Interest and other income, net	3,959	5,187	10,601
Income from continuing operations before income taxes	133,426	152,898	136,890
Income taxes	13,983	11,552	69,345
Income from continuing operations	119,443	141,346	67,545
Discontinued operations:
Income (loss) from operations, net of income taxes	910	(2,256)	(12,597)
Gain on sale, net of income taxes	109,083
Income (loss) from discontinued operations	109,993	(2,256)	(12,597)
Net income	$ 229,436	$ 139,090	$ 54,948
Income from continuing operations per share:
Basic	$ 1.17	$ 1.31	$ 0.58
Diluted	$ 1.16	$ 1.29	$ 0.58
Income (loss) from discontinued operations per share:
Basic	$ 1.08	$ (0.02)	$ (0.11)
Diluted	$ 1.07	$ (0.02)	$ (0.11)
Net income per share
Basic	$ 2.25	$ 1.29	$ 0.47
Diluted	$ 2.23	$ 1.27	$ 0.47
Number of shares used in per share calculations:
Basic	101,766	107,647	116,037
Diluted	102,711	109,192	117,364