v3.19.3.a.u2
Stock-Based Compensation - Narrative (Details)
shares in Millions
 12 Months Ended
Jan. 26, 2020
period
shares
Jan. 27, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares may be issued under the Restated 2007 Plan (in shares) 230  
Number of shares available for grant (in shares) 29 35
Quarterly vesting schedule - options 6.25%  
Semi-annual vesting schedule - RSUs and PSUs for grants made prior to 5/18/16 (as percent) 12.50%  
Quarterly vesting schedule - RSUs and PSUs for grants made on or after 5/18/16 (as percent) 6.25%  
RSUs, PSUs and Market-based PSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares available for grant (in shares) 29  
Employee Stock Option    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Vesting rights (as percent) 25.00%  
Expiration period 10 years  
Restricted Stock Units and Performance Shares    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 4 years  
Vesting rights (as percent) 25.00%  
Employee Stock Purchase Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum aggregated number of shares under 2012 ESPP (in shares)   89
Total shares purchased (in shares)   30
Shares reserved for future issuance (in shares)   59
Offering period 24 months  
Number of purchase periods in offering period | period 4  
Purchase period duration 6 months  
Maximum employee subscription rate (as percent) 10.00%  
Potential maximum employee subscription rate by BOD approval (as percent) 15.00%  
Purchase price of ESPP (as percent) 85.00%  
Market-based PSUs    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting period 3 years  
Maximum issuable shares of Market-based PSUs, percentage (as percent) 100.00%