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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Summary Of Significant Accounting Policies [Line Items]      
Impairment charges $ 8,928    
Advertising costs reported as prepaid expenses 3,724 $ 2,146  
Advertising expense 114,104 103,882 $ 91,615
Foreign currency translation losses (7,963) (14,128) 7,194
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    
Accumulated Other Comprehensive Income (Loss)      
Summary Of Significant Accounting Policies [Line Items]      
Foreign currency translation losses (23,479) (15,516)  
Unrealized gains / (losses) on marketable securities, net of tax 28 89  
Change in unrealized gains / (losses) on marketable securities, tax $ 36 $ 201 $ 378
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    
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    
Building      
Summary Of Significant Accounting Policies [Line Items]      
Average useful life (in years) 39 years