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Employee Benefit Plans - Additional Information (Details) $ in Billions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 10, 2020 shares | Jan. 23, 2021 USD ($) stock_incentive_plan shares | Jan. 25, 2020 shares | Jan. 23, 2021 USD ($) period stock_incentive_plan shares | Jan. 25, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of stock incentive plans (stock incentive plan) | stock_incentive_plan |  | 1 |  | 1 |
Total compensation cost related to unvested share-based awards | $ |  | $ 4.0 |  | $ 4.0 |
Expected period of recognition of compensation cost |  |  |  | 2 years 8 months 12 days |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for issuance (in shares) |  | 721,000,000 |  | 721,000,000 |
Consecutive offering period |  |  |  | 24 months |
Number of purchase periods | period |  |  |  | 4 |
Purchase period |  |  |  | 6 months |
ESPP discount percentage from market price, beginning of purchase period |  |  |  | 15.00% |
Shares issued under employee purchase plan (in shares) |  | 8,000,000 | 9,000,000 | 8,000,000 | 9,000,000
Shares reserved for issuance (in shares) |  | 133,000,000 |  | 133,000,000 |
2005 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Extension term of plan | 9 years |  |  |  |
Additional shares approved (in shares) | 96,000,000 |  |  |  |
Shares reserved for issuance (in shares) |  | 790,000,000 |  | 790,000,000 |
2005 Plan | Stock awards subsequent to November 12, 2009 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares reserved for issuance (in shares) |  | 253,000,000 |  | 253,000,000 |
Reduction in shares available for issuance pursuant to November 12, 2009 amendment (in shares) |  | 1.5 |  | 1.5 |

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