Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Statement [Abstract]
Net revenues	$ 598,937	$ 543,933	$ 1,177,892	$ 1,126,717
Cost of revenues	182,816	187,713	362,516	386,124
Gross margin	416,121	356,220	815,376	740,593
Operating expenses:
Research and development	125,002	113,887	236,543	235,334
Selling, general and administrative	96,339	91,928	188,726	188,129
Amortization of acquisition-related intangibles	2,418	2,319	4,836	4,467
Litigation and contingencies	28,600	0	28,600	0
Total operating expenses	252,359	208,134	458,705	427,930
Operating income	163,762	148,086	356,671	312,663
Interest and other expense, net	10,997	10,003	20,927	19,675
Income before income taxes	152,765	138,083	335,744	292,988
Provision for income taxes	11,304	14,646	37,260	39,720
Net income	$ 141,461	$ 123,437	$ 298,484	$ 253,268
Net income per common share:
Basic	$ 0.53	$ 0.47	$ 1.12	$ 0.97
Diluted	$ 0.49	$ 0.46	$ 1.05	$ 0.93
Cash dividends per common share	$ 0.25	$ 0.22	$ 0.50	$ 0.44
Shares used in per share calculations:
Basic	268,478	260,605	265,350	262,143
Diluted	290,685	270,265	284,270	272,182