Summary Of Significant Accounting Policies (Narrative) (Details) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010	Jan. 29, 2011
Summary Of Significant Accounting Policies [Abstract]
Total share-based compensation expense	$ 18,100,000	$ 16,900,000	$ 49,799,000	$ 44,913,000
Options to purchase common stock exercised	1.8		6.1
Common stock outstanding	22.3		22.3
In-transit inventory accrual	$ 504,300,000	$ 493,800,000	$ 504,300,000	$ 493,800,000	$ 445,700,000