Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
Income Statement [Abstract]
Net revenues	$ 509,767	$ 511,091	$ 1,636,484	$ 1,681,763
Cost of revenues	170,493	174,805	556,617	598,501
Gross margin	339,274	336,286	1,079,867	1,083,262
Operating expenses:
Research and development	129,055	108,245	364,389	320,036
Selling, general and administrative	86,823	88,934	274,952	274,011
Amortization of acquisition-related intangibles	2,554	1,982	7,021	5,587
Restructuring charges	0	0	0	3,369
Total operating expenses	218,432	199,161	646,362	603,003
Operating income	120,842	137,125	433,505	480,259
Interest and other expense, net	5,149	7,187	24,824	23,596
Income before income taxes	115,693	129,938	408,681	456,663
Provision for income taxes	12,045	2,924	51,765	48,989
Net income	$ 103,648	$ 127,014	$ 356,916	$ 407,674
Net income per common share:
Basic	$ 0.40	$ 0.49	$ 1.36	$ 1.54
Diluted	$ 0.38	$ 0.47	$ 1.31	$ 1.50
Cash dividends per common share	$ 0.22	$ 0.19	$ 0.66	$ 0.57
Shares used in per share calculations:
Basic	260,690	261,257	261,723	264,183
Diluted	271,174	267,884	271,861	271,713