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Stock-Based Awards - Narratives (Details) - USD ($)
$ in Millions
3 Months Ended
Apr. 25, 2020
Apr. 27, 2019
Jan. 25, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Net tax (deficiency) benefit $ (0.5) $ 0.6  
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock options $ 2.6    
Total compensation cost not yet recognized, period for recognition 2 years 8 months 12 days    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock options $ 19.9    
Total compensation cost not yet recognized, period for recognition 3 years 1 month 6 days    
Granted (in shares) 510,211    
Shares outstanding 647,839   174,917
Shares canceled (in shares) 3,498    
Performance RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation expense related to stock options $ 4.9    
Total compensation cost not yet recognized, period for recognition 1 year 6 months    
Compensation expense $ 20.3    
RSUs outstanding (in shares) 32,769    
Granted (in shares) 65,538    
Shares outstanding 474,644   639,738
Shares canceled (in shares) 218,317    
Target Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding 318,438    
Supplemental Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 32,769    
Shares outstanding 156,206