Quarterly report pursuant to Section 13 or 15(d)

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

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Acquisitions and Loss on Impairment - Components of Identified Intangible Assets Associated with Acquisition and their Estimated Useful Lives (Detail) - USD ($)
$ in Thousands
9 Months Ended
May 05, 2016
Feb. 02, 2015
Oct. 31, 2016
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life     4 years 8 months 12 days
Customer Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life     4 years 3 months 18 days
Non-Compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life     1 year 9 months 18 days
DCC Labs [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Fair Value $ 3,100    
DCC Labs [Member] | Tradename [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life 5 years    
Identified intangible assets, Fair Value $ 200    
DCC Labs [Member] | Customer Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life 9 years    
Identified intangible assets, Fair Value $ 1,400    
DCC Labs [Member] | Non-Compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life 2 years    
Identified intangible assets, Fair Value $ 100    
DCC Labs [Member] | Existing Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life 7 years    
Identified intangible assets, Fair Value $ 1,400    
Timeline Labs [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Fair Value   $ 6,720  
Timeline Labs [Member] | Tradename [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life   7 years  
Identified intangible assets, Fair Value   $ 620  
Timeline Labs [Member] | Customer Contracts [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life   7 years  
Identified intangible assets, Fair Value   $ 4,760  
Timeline Labs [Member] | Non-Compete Agreements [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life   2 years  
Identified intangible assets, Fair Value   $ 170  
Timeline Labs [Member] | Existing Technology [Member]      
Finite-Lived Intangible Assets [Line Items]      
Identified intangible assets, Useful life   5 years  
Identified intangible assets, Fair Value   $ 1,170