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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
USD ($)
Package
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
Feb. 01, 2019
USD ($)
Feb. 02, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Impairment charges $ 3,544 $ 11,410 $ 4,341    
Payment terms of customers 30 days        
Reward coupon expiration period after issuance 60 days        
Sales return reserve $ 51,990 [1] 28,902 [1] 24,882    
Foreign currency translation losses $ (16,585) 23,672 (10,533)    
Net cumulative effect of increase (decrease) to retained earnings         $ (4,496)
Number of lease practical expedients package | Package 3        
Accounting Standards Update 2014-09          
Summary Of Significant Accounting Policies [Line Items]          
Net cumulative effect of increase (decrease) to retained earnings         $ 11,060
Accounting Standards Update 2016-02 | Subsequent Event          
Summary Of Significant Accounting Policies [Line Items]          
Lease liabilities       $ 1,300,000  
Rght-of-use assets       $ 1,200,000  
Accumulated Other Comprehensive Income (Loss)          
Summary Of Significant Accounting Policies [Line Items]          
Foreign currency translation losses $ 26,925 10,340      
Unrealized losses on marketable securities, net of tax 178 311      
Change in unrealized gains (losses) on marketable securities, tax 105 (137) (28)    
Selling, General and Administrative Expenses          
Summary Of Significant Accounting Policies [Line Items]          
Advertising expense 143,332 134,632 127,159    
Web creative expenses 41,334 37,099 $ 31,237    
Prepaid Expense And Other Current Assets          
Summary Of Significant Accounting Policies [Line Items]          
Advertising costs reported as prepaid expenses $ 2,466 $ 2,491      
Leasehold Improvements          
Summary Of Significant Accounting Policies [Line Items]          
Depreciable life (in years) Lesser of the lease term or useful life for leasehold improvements        
Furniture and Fixtures          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life (in years) 5 years        
Building          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life (in years) 39 years        
Equipment | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life (in years) 3 years        
Equipment | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Average useful life (in years) 10 years        
[1] Refer to Note 2, “Summary of Significant Accounting Policies”, for the change in accounting for the sales return reserve resulting from an accounting standards update.