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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended 36 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2017
Summary Of Significant Accounting Policies [Line Items]        
Impairment charges $ 4,341 $ 8,928    
Foreign currency translation losses (10,533) (7,963) $ (14,128)  
Average excess tax benefit from share-based awards       $ 1,274
Cost of Sales        
Summary Of Significant Accounting Policies [Line Items]        
Impairment charges 4,341 7,429    
Selling, General and Administrative Expenses        
Summary Of Significant Accounting Policies [Line Items]        
Impairment charges   1,499    
Advertising expense 127,159 114,104 103,882  
Web creative expenses 31,237 32,003 27,183  
Accumulated Other Comprehensive Income (Loss)        
Summary Of Significant Accounting Policies [Line Items]        
Foreign currency translation losses (34,012) (23,479)    
Unrealized gains / (losses) on marketable securities, net of tax (57) 28    
Change in unrealized gains / (losses) on marketable securities, tax 28 36 $ 201  
Prepaid Expense And Other Current Assets        
Summary Of Significant Accounting Policies [Line Items]        
Advertising costs reported as prepaid expenses $ 2,087 $ 3,724   $ 2,087
Furniture and Fixtures        
Summary Of Significant Accounting Policies [Line Items]        
Average useful life (in years) 5 years      
Leasehold Improvements        
Summary Of Significant Accounting Policies [Line Items]        
Depreciable life (in years) Lesser of the lease term or useful life for leasehold improvements      
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