Fair Value Measurements - Additional Information (Detail) (USD $)							9 Months Ended
	Oct. 27, 2012	Jan. 28, 2012	Oct. 29, 2011	Oct. 27, 2012 Fair Value, Inputs, Level 1	Jan. 28, 2012 Fair Value, Inputs, Level 1	Oct. 29, 2011 Fair Value, Inputs, Level 1	Oct. 27, 2012 Fair Value, Inputs, Level 3	Oct. 27, 2012 Fair Value, Inputs, Level 3 Minimum	Oct. 27, 2012 Fair Value, Inputs, Level 3 Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investments, par value	$ 124,000,000	$ 193,000,000	$ 195,000,000
Long-term investments, fair value	90,000,000	153,000,000	158,000,000
Redemption period in valuing auction rate securities							7 years
Investment maturity date range, beginning							2016
Investment maturity date range, ending							2041
Investment weighted average maturity year							2034
Discount rate								2.91%	13.41%
Weighted Average Discount Rate, Percent							7.72%
Long term debt, fair value				$ 2,900,000,000	$ 2,400,000,000	$ 2,500,000,000