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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 12 Months Ended
Aug. 03, 2013
Jul. 28, 2012
Aug. 03, 2013
Week
Jul. 28, 2012
Feb. 02, 2013
Week
Jan. 28, 2012
Summary Of Significant Accounting Policies [Line Items]            
Weeks in the fiscal year     52   53  
Share-based compensation $ 19,200,000 $ 15,600,000 $ 35,679,000 $ 29,879,000    
Options to purchase common stock exercised 1.9   4.1      
Common stock outstanding 32.1   32.1      
Highly liquid investments maximum maturity days     90 days      
Cash and cash equivalents 1,858,798,000 1,620,402,000 1,858,798,000 1,620,402,000 1,811,957,000 1,507,112,000
In-transit inventory accrual 467,200,000 382,000,000 467,200,000 382,000,000 418,300,000  
Outside United States
            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents 844,600,000   844,600,000      
Reinvest Undistributed Earnings
            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents $ 236,600,000   $ 236,600,000      
Minimum
            
Summary Of Significant Accounting Policies [Line Items]            
Short-term investments maturity term     90      
Maximum
            
Summary Of Significant Accounting Policies [Line Items]            
Short-term investments maturity term     1