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Commitments and Contingencies (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2015
Apr. 29, 2016
May. 01, 2015
Jul. 31, 2015
Customer Concentration Risk | Sales Revenue        
Concentration Risk [Line Items]        
Concentration risk percentage   8.00% 10.00%  
Settled Litigation | SRI International        
Concentration Risk [Line Items]        
Litigation settlement amount $ 7.5      
Expense recognized related to litigation     $ 3.0 $ 1.9
Prepaid patent license agreement $ 2.6     $ 2.6