Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
Income Statement [Abstract]
Net revenues	$ 582,784	$ 615,463
Cost of revenues	198,411	223,132
Gross margin	384,373	392,331
Operating expenses:
Research and development	121,447	106,017
Selling, general and administrative	96,201	96,396
Amortization of acquisition-related intangibles	2,148	1,623
Total operating expenses	219,796	204,036
Operating income	164,577	188,295
Interest and other expense, net	9,672	7,811
Income before income taxes	154,905	180,484
Provision for income taxes	25,074	26,110
Net income	$ 129,831	$ 154,374
Net income per common share:
Basic	$ 0.49	$ 0.58
Diluted	$ 0.47	$ 0.56
Cash dividends per common share	$ 0.22	$ 0.19
Shares used in per share calculations:
Basic	263,055	265,313
Diluted	273,820	276,077