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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Feb. 02, 2017
Jan. 31, 2018
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Summary Of Significant Accounting Policies [Line Items]          
Impairment charges     $ 11,410 $ 4,341 $ 8,928
Additional GAAP tax expense   $ 64,705,000      
Foreign currency translation losses     23,672 (10,533) (7,963)
Cumulative reduction to beginning retained earning $ (984)        
Recognition of previously unrecognized excess tax benefit $ 224        
Decrease in net cash used in financing activities       (350) (6,194)
Increase in net cash used in operating activities       350 6,194
Excess tax deficit     (2,984)    
Accumulated Other Comprehensive Income (Loss)          
Summary Of Significant Accounting Policies [Line Items]          
Foreign currency translation losses     10,340 34,012  
Unrealized losses on marketable securities, net of tax     311 57  
Change in unrealized losses on marketable securities, tax     137 28 36
Prepaid Expense And Other Current Assets          
Summary Of Significant Accounting Policies [Line Items]          
Advertising costs reported as prepaid expenses   $ 2,491 2,491 2,087  
Cost of Sales          
Summary Of Significant Accounting Policies [Line Items]          
Impairment charges         7,429
Selling, General and Administrative Expenses          
Summary Of Significant Accounting Policies [Line Items]          
Impairment charges         1,499
Advertising expense     134,632 127,159 114,104
Web creative expenses     $ 37,099 $ 31,237 $ 32,003
Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Measurement period to record provisional amounts     1 year    
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