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Employee Benefit Plans - Valuation of Employee Share-Based Awards - Employee Stock Purchase Rights (Details) - Employee Stock Purchase Rights - $ / shares
12 Months Ended
Jul. 30, 2022
Jul. 31, 2021
Jul. 25, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 27.90% 29.20% 22.20%
Risk-free interest rate 0.10% 0.30% 1.80%
Expected dividend 3.20% 3.20% 3.00%
Expected life (in years) 1 year 2 months 12 days 1 year 3 months 18 days 1 year 3 months 18 days
Weighted-average estimated grant date fair value per share (in dollars per share) $ 12.90 $ 12.46 $ 10.20