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Employee Benefit Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 01, 2014
Jan. 25, 2020
Jan. 26, 2019
Jan. 27, 2018
Defined Contribution Plan Disclosure [Line Items]        
Minimum age limit 18 years      
Minimum service period 6 months      
Participants contribution (as a percent) 100.00%      
Matching contribution expense   $ 1.6 $ 1.3 $ 1.0
Matching on up to first 3% of participant's annual compensation        
Defined Contribution Plan Disclosure [Line Items]        
Employer's matching percentage 100.00%      
Matching on up to first 3% of participant's annual compensation | Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of eligible employee compensation matched 3.00%      
Matching between 3% and 5% of participant's annual compensation        
Defined Contribution Plan Disclosure [Line Items]        
Employer's matching percentage 50.00%      
Matching between 3% and 5% of participant's annual compensation | Minimum        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of eligible employee compensation matched 3.00%      
Matching between 3% and 5% of participant's annual compensation | Maximum        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of eligible employee compensation matched 5.00%