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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 28, 2012
Jul. 30, 2011
Jan. 28, 2012
Summary Of Significant Accounting Policies [Line Items]          
Share-based compensation $ 15,600,000 $ 16,200,000 $ 29,879,000 $ 31,704,000  
Options to purchase common stock exercised 2.2   4.1    
Common stock outstanding 36.3   36.3    
Highly liquid investments maximum maturity days 90 days        
In-transit inventory accrual $ 382,000,000 $ 497,500,000 $ 382,000,000 $ 497,500,000 $ 395,900,000