CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 28, 2013	Apr. 29, 2012
Revenue	$ 954,739	$ 924,877
Cost of revenue	436,171	461,513
Gross profit	518,568	463,364
Operating expenses
Research and development	327,161	283,902
Sales, general and administrative	108,626	106,636
Total operating expenses	435,787	390,538
Income from operations	82,781	72,826
Interest income	5,076	5,198
Other income (expense), net	205	(929)
Income before income tax expense	88,062	77,095
Income tax expense	10,171	16,658
Net income	$ 77,891	$ 60,437
Basic net income per share	$ 0.13	$ 0.10
Shares used in basic per share computation (in shares)	616,872	615,780
Diluted net income per share	$ 0.13	$ 0.10
Shares used in diluted per share computation (in shares)	619,302	623,786
Cash dividends declared and paid per common share	$ 0.075	$ 0.000