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Summary Of Significant Accounting Policies (Details) (USD $)
Share data in Millions, unless otherwise specified
3 Months Ended
Apr. 28, 2012
Apr. 30, 2011
Jan. 28, 2012
Summary Of Significant Accounting Policies [Abstract]      
Share-based compensation $ 14,271,000 $ 15,448,000  
Options to purchase common stock exercised 1.9    
Common stock outstanding 38.6    
Highly liquid investments maximum maturity days 90 days    
In-transit inventory accrual $ 401,100,000 $ 423,900,000 $ 395,900,000