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Stock-Based Compensation - Equity Incentive Plans (Details)
shares in Thousands
12 Months Ended
Jan. 26, 2020
$ / shares
shares
Number of Shares  
RSUs, PSUs and Market-based PSUs, outstanding, beginning balance (in shares) 16,000
RSUs, PSUs and Market-based PSUs, granted (in shares) 7,000
RSUs, PSUs and Market-based PSUs, vested (in shares) (8,000)
RSUs, PSUs and Market-based PSUs, canceled and forfeited (in shares) (1,000)
RSUs, PSUs and Market-based PSUs, outstanding, ending balance (in shares) 14,000
Vested and expected to vest, RSUs, PSUs and Market-based PSUs (in shares) 11,000
Weighted Average Grant-Date Fair Value  
PSUs and Market-based PSUs, weighted average grant date fair value, beginning balance (in USD per share) | $ / shares $ 129.92
PSUs and Market-based PSUs, weighted average grant date fair value, granted (in USD per share) | $ / shares 184.47
PSUs and Market-based PSUs, weighted average grant date fair value, vested (in USD per share) | $ / shares 92.70
PSUs and Market-based PSUs, weighted average grant date fair value, canceled and forfeited (in USD per share) | $ / shares 185.46
PSUs and Market-based PSUs, weighted average grant date fair value, ending balance (in USD per share) | $ / shares 176.72
Vested and expected to vest, RSUs, PSUs and Market-based PSUs, weighted average grant date fair value (in USD per share) | $ / shares $ 176.46
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Maximum number of market-based PSUs issuable (in shares) 60
Market-based PSUs  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Measurement period 3 years