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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Oct. 27, 2012
Oct. 29, 2011
Jan. 28, 2012
Summary Of Significant Accounting Policies [Line Items]          
Share-based compensation $ 19,700,000 $ 18,100,000 $ 49,600,000 $ 49,799,000  
Options to purchase common stock exercised 2.2   6.3    
Common stock outstanding 38.8   38.8    
Highly liquid investments maximum maturity days 90 days        
Cash and cash equivalents held for reinvestment 317,900,000   317,900,000    
In-transit inventory accrual 394,100,000 504,300,000 394,100,000 504,300,000 395,900,000
Outside United States
          
Summary Of Significant Accounting Policies [Line Items]          
Cash and cash equivalent held $ 828,400,000   $ 828,400,000