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Employee Benefit Plans - Employee Stock Purchase Plan (Details) - Employee stock purchase plan
shares in Millions
12 Months Ended
Jul. 30, 2022
period
shares
Jul. 31, 2021
shares
Jul. 25, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Consecutive offering period 24 months    
Number of purchase periods | period 4    
Purchase period 6 months    
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date 15.00%    
Shares issued under employee purchase plan, shares (in shares) 18 17 18
Shares reserved for issuance (in shares) 107