Quarterly report pursuant to Section 13 or 15(d)

Acquisition and Loss on Impairment - Summary of Allocation of Purchase Price (Detail)

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Acquisition and Loss on Impairment - Summary of Allocation of Purchase Price (Detail) - USD ($)
$ in Thousands
 9 Months Ended
May 05, 2016
Feb. 02, 2015
Oct. 31, 2016
Oct. 31, 2015
May 31, 2016
Feb. 02, 2016
Jan. 31, 2016
Aug. 03, 2015
Estimated Fair value of consideration:                
Cash, net of cash acquired     $ 5,243 $ 11,686        
Estimated Fair value of assets acquired and liabilities assumed:                
Goodwill     $ 45,689       $ 40,175  
DCC Labs [Member]                
Estimated Fair value of consideration:                
Cash, net of cash acquired $ 5,243              
Closing stock consideration 2,640              
Total purchase price 7,883              
Estimated Fair value of assets acquired and liabilities assumed:                
Current assets 826              
Other long-term assets 116              
Finite-life intangible assets 3,100              
Goodwill 5,401              
Current liabilities (618)              
Other long-term liabilities (942)              
Allocated purchase price $ 7,883              
Timeline Labs [Member]                
Estimated Fair value of consideration:                
Cash, net of cash acquired   $ 14,186            
Closing stock consideration   3,019            
Deferred stock consideration   4,959     $ 200 $ 3,200   $ 1,800
Contingent consideration   475            
Total purchase price   22,639            
Estimated Fair value of assets acquired and liabilities assumed:                
Current assets   95            
Other long-term assets   108            
Finite-life intangible assets   6,720            
Goodwill   15,787            
Current liabilities   (71)            
Allocated purchase price   $ 22,639