Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Components of Identified Intangible Assets Associated with Acquisition and their Estimated Useful Lives (Detail)

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Acquisitions - Components of Identified Intangible Assets Associated with Acquisition and their Estimated Useful Lives (Detail) - USD ($)
$ in Thousands
 9 Months Ended
May 05, 2017
Oct. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life   2 years 4 months 24 days
DCC Labs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Fair Value $ 810  
Tradename [Member] | DCC Labs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life 4 years  
Identified intangible assets, Fair Value $ 60  
Customer Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life   2 years 3 months 19 days
Customer Contracts [Member] | DCC Labs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life 2 years  
Identified intangible assets, Fair Value $ 230  
Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life   6 months
Non-Compete Agreements [Member] | DCC Labs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life 2 years  
Identified intangible assets, Fair Value $ 30  
Existing Technology [Member] | DCC Labs [Member]    
Finite-Lived Intangible Assets [Line Items]    
Identified intangible assets, Useful life 3 years  
Identified intangible assets, Fair Value $ 490