Quartely Summary (Details) (USD $)	3 Months Ended									12 Months Ended
	Jan. 26, 2014	Oct. 27, 2013	Jul. 28, 2013	Apr. 28, 2013	Jan. 27, 2013	Oct. 28, 2012	Jul. 29, 2012		Apr. 29, 2012	Jan. 26, 2014	Jan. 27, 2013	Jan. 29, 2012
Selected Quarterly Financial Information [Abstract]
Revenue	$ 1,144,218,000	$ 1,053,967,000	$ 977,238,000	$ 954,739,000	$ 1,106,902,000	$ 1,204,110,000	$ 1,044,270,000		$ 924,877,000	$ 4,130,162,000	$ 4,280,159,000	$ 3,997,930,000
Cost of revenue	524,976,000	469,552,000	431,700,000	436,171,000	521,300,000	567,452,000	503,551,000		461,513,000	1,862,399,000	2,053,816,000	1,941,413,000
Gross profit	619,242,000	584,415,000	545,538,000	518,568,000	585,602,000	636,658,000	540,719,000		463,364,000	2,267,763,000	2,226,343,000	2,056,517,000
Net income	146,917,000	118,734,000	96,448,000	77,891,000	173,973,000	209,080,000	119,046,000	[1]	60,437,000	439,990,000	562,536,000	581,090,000
Basic net income per share	$ 0.26	$ 0.20	$ 0.16	$ 0.13	$ 0.28	$ 0.34	$ 0.19		$ 0.10	$ 0.75	$ 0.91	$ 0.96
Diluted net income per share	$ 0.25	$ 0.20	$ 0.16	$ 0.13	$ 0.28	$ 0.33	$ 0.19		$ 0.10	$ 0.74	$ 0.90	$ 0.94
Charitable contribution							$ 25,000,000
Charitable contribution period			10

[1] Includes net present value of a $25 million charitable contribution pledged in fiscal year 2013 to Stanford Hospital and Clinic, payable over a ten year period.