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Acquisitions - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed at Acquisition Date (Detail) - USD ($)
$ in Thousands
Sep. 29, 2015
Mar. 31, 2015
Jan. 31, 2017
Jan. 31, 2016
Allocation of purchase price        
Goodwill     $ 95,804 $ 95,804
Zinc Ahead Inc [Member]        
Business Acquisition [Line Items]        
Purchase price Cash $ 119,935      
Allocation of purchase price        
Cash 3,107      
Accounts receivable 4,600      
Other current and non-current assets 5,140      
Deferred tax liabilities, net (12,316)      
Other current and non-current liabilities (8,730)      
Net assets (liabilities) (8,199)      
Purchased intangible assets 43,027      
Goodwill 85,107      
Total purchase price 119,935      
Zinc Ahead Inc [Member] | Customer contracts and relationships [Member]        
Allocation of purchase price        
Purchased intangible assets $ 31,823      
Useful Lives of Intangible Assets 10 years      
Zinc Ahead Inc [Member] | Software [Member]        
Allocation of purchase price        
Purchased intangible assets $ 10,063      
Useful Lives of Intangible Assets 4 years 6 months      
Zinc Ahead Inc [Member] | Brand [Member]        
Allocation of purchase price        
Purchased intangible assets $ 1,141      
Useful Lives of Intangible Assets 3 years 6 months      
Qforma CrowdLink [Member]        
Business Acquisition [Line Items]        
Purchase price Cash   $ 9,750    
Allocation of purchase price        
Cash   56    
Accounts receivable   1,085    
Deferred tax assets, net   143    
Other current and non-current assets   50    
Other current and non-current liabilities   (731)    
Net assets (liabilities)   603    
Purchased intangible assets   3,300    
Goodwill   5,847    
Total purchase price   9,750    
Qforma CrowdLink [Member] | Software [Member]        
Allocation of purchase price        
Purchased intangible assets   $ 500    
Useful Lives of Intangible Assets   5 years    
Qforma CrowdLink [Member] | Database [Member]        
Allocation of purchase price        
Purchased intangible assets   $ 1,800    
Useful Lives of Intangible Assets   5 years    
Qforma CrowdLink [Member] | Customer relationships [Member]        
Allocation of purchase price        
Purchased intangible assets   $ 800    
Useful Lives of Intangible Assets   4 years    
Qforma CrowdLink [Member] | Existing technology [Member]        
Allocation of purchase price        
Purchased intangible assets   $ 200    
Useful Lives of Intangible Assets   5 years