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Acquisitions - Purchase Price Allocation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 27, 2019
Aug. 17, 2018
Jan. 28, 2018
Jul. 01, 2017
Business Acquisition [Line Items]        
Goodwill $ 351,141   $ 341,897  
TrackNet        
Business Acquisition [Line Items]        
Finite-lived intangible asset   $ 3,000    
Goodwill 4,316 $ 4,300    
Other assets (liabilities), net 1,184      
Total consideration 8,500      
AptoVision        
Business Acquisition [Line Items]        
Indefinite-lived intangible asset - IPR&D 2,300      
Goodwill 12,194     $ 12,200
Other (liabilities) assets, net (3,875)      
Total consideration $ 34,619      
Core technologies | TrackNet        
Business Acquisition [Line Items]        
Estimated useful life 3 years      
Finite-lived intangible asset $ 3,000      
Developed technology | AptoVision        
Business Acquisition [Line Items]        
Finite-lived intangible asset $ 20,000      
Customer relationships | AptoVision        
Business Acquisition [Line Items]        
Estimated useful life 3 years      
Finite-lived intangible asset $ 4,000      
Minimum | Developed technology | AptoVision        
Business Acquisition [Line Items]        
Estimated useful life 6 years      
Maximum | Developed technology | AptoVision        
Business Acquisition [Line Items]        
Estimated useful life 7 years