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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands, shares in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Nov. 01, 2014
Oct. 31, 2015
Nov. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Summary Of Significant Accounting Policies [Line Items]            
Share-based compensation $ 27,300 $ 25,700 $ 71,063 $ 67,671    
Options to purchase common stock exercised 1.5   3.6      
Options outstanding to purchase common stock 30.3   30.3      
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 141,100   $ 141,100      
Cash and cash equivalents 1,723,336 2,153,625 1,723,336 2,153,625 $ 2,493,775 $ 2,149,746
In-transit inventory accrual 816,600 $ 661,100 816,600 $ 661,100 $ 495,200  
Amounts classified from 'Other', in operating activity, to 'Purchase of investments' or 'Sales and maturities of investments' in cash flows from investing activity     13,200      
Outside United States            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents 1,072,500   1,072,500      
Reinvest Undistributed Earnings            
Summary Of Significant Accounting Policies [Line Items]            
Cash and cash equivalents $ 297,900   $ 297,900