Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Dec. 31, 2011	Jan. 01, 2011
Condensed Consolidated Statements of Income [Abstract]
Net revenues	$ 511,091	$ 567,190	$ 1,681,763	$ 1,781,593
Cost of revenues	174,805	194,419	598,501	615,855
Gross margin	336,286	372,771	1,083,262	1,165,738
Operating expenses:
Research and development	108,245	98,453	320,036	289,515
Selling, general and administrative	88,934	86,531	274,011	257,763
Amortization of acquisition-related intangibles	1,982	0	5,587	0
Restructuring charges		4,276	3,369	4,276
Total operating expenses	199,161	189,260	603,003	551,554
Operating income	137,125	183,511	480,259	614,184
Interest and other expense, net	(7,187)	(3,302)	(23,596)	(11,916)
Income before income taxes	129,938	180,209	456,663	602,268
Provision for income taxes	2,924	27,868	48,989	120,445
Net income	$ 127,014	$ 152,341	$ 407,674	$ 481,823
Net income per common share:
Basic	$ 0.49	$ 0.59	$ 1.54	$ 1.82
Diluted	$ 0.47	$ 0.58	$ 1.50	$ 1.79
Cash dividends per common share	$ 0.19	$ 0.16	$ 0.57	$ 0.48
Shares used in per share calculations:
Basic	261,257	259,418	264,183	265,085
Diluted	267,884	263,612	271,713	268,778