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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands, shares in Millions
 3 Months Ended 12 Months Ended
Apr. 29, 2017
USD ($)
Location
shares
Apr. 30, 2016
USD ($)
Jan. 28, 2017
USD ($)
Jan. 30, 2016
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Weeks in the fiscal year 371 days   364 days  
Share-based compensation $ 24,051 $ 24,959    
Options to purchase common stock exercised | shares 1.6      
Options outstanding to purchase common stock | shares 25.6      
Unrecognized compensation cost related to nonvested share-based compensation arrangements $ 146,700      
Highly liquid investments maximum maturity days 90 days      
Cash and cash equivalents $ 2,669,495 1,944,155 $ 2,929,849 $ 2,095,473
In-transit inventory accrual 501,500 544,000 $ 641,900  
Provision for income taxes 296,229 $ 316,623    
Adjustments for New Accounting Pronouncement        
Summary Of Significant Accounting Policies [Line Items]        
Provision for income taxes (24,600)      
Outside United States        
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents 1,233,400      
Reinvest Undistributed Earnings        
Summary Of Significant Accounting Policies [Line Items]        
Cash and cash equivalents $ 263,200      
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Number of lease locations | Location 3,800      
Minimum | Key revenue streams concentration risk | Point of sale at the registers | Sales revenue net        
Summary Of Significant Accounting Policies [Line Items]        
Concentration risk, percentage 95.00%