Stockholders' Equity (Details) (USD $)	12 Months Ended
	Jan. 27, 2013	Jan. 29, 2012	Jan. 30, 2011
Notes to financial statements [Abstract]
Aggregate maximum amount of common stock to be repurchased	$ 2,700,000,000
Aggregate number of shares repurchased under stock repurchase program (in shares)	99,300,000
Treasury Stock, Value, Acquired, Cost Method	1,560,000,000
Authorized cost of shares to be repurchased	1,140,000,000
Adjustments Related to Tax Withholding for Share-based Compensation	$ 25,805,000	$ 17,512,000	$ 16,124,000
Common Stock [Member]
Notes to financial statements [Abstract]
Shares Paid for Tax Withholding for Share Based Compensation	1,836,097	1,117,651	1,117,179