Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		6 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Condensed Consolidated Statements of Income [Abstract]
Net revenues	$ 555,209	$ 619,666	$ 1,170,672	$ 1,214,403
Cost of revenues	200,564	213,260	423,696	421,436
Gross margin	354,645	406,406	746,976	792,967
Operating expenses:
Research and development	105,774	96,578	211,791	191,062
Selling, general and administrative	88,681	87,174	185,077	171,232
Amortization of acquisition-related intangibles	1,982	0	3,605	0
Restructuring charges	3,369	0	3,369	0
Total operating expenses	199,806	183,752	403,842	362,294
Operating income	154,839	222,654	343,134	430,673
Interest and other expense, net	(8,598)	(3,484)	(16,409)	(8,614)
Income before income taxes	146,241	219,170	326,725	422,059
Provision for income taxes	19,955	48,275	46,065	92,577
Net income	$ 126,286	$ 170,895	$ 280,660	$ 329,482
Net income per common share:
Basic	$ 0.48	$ 0.66	$ 1.06	$ 1.23
Diluted	$ 0.47	$ 0.65	$ 1.03	$ 1.22
Cash dividends per common share	$ 0.19	$ 0.16	$ 0.38	$ 0.32
Shares used in per share calculations:
Basic	264,006	260,151	264,853	267,355
Diluted	267,927	263,286	273,009	270,484