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Commitments and Contingencies (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 29, 2016
Jul. 31, 2015
May 01, 2015
Jul. 29, 2016
Jul. 31, 2015
Customer Concentration Risk | Sales Revenue            
Concentration Risk [Line Items]            
Concentration risk percentage   8.00% 9.00%   8.00% 10.00%
Settled Litigation | SRI International            
Concentration Risk [Line Items]            
Litigation settlement amount $ 7.5          
Expense recognized related to litigation     $ 1.9 $ 3.0    
Prepaid patent license agreement $ 2.6   $ 2.6     $ 2.6