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Stockholders' Equity - Additional Information (Detail) |  |  | 12 Months Ended | 192 Months Ended |
--- | --- | --- | --- | --- | ---
May 22, 2019 $ / shares | Sep. 13, 2018 shares | Apr. 26, 2019 USD ($) Period $ / shares shares | Apr. 27, 2018 USD ($) $ / shares shares | Apr. 28, 2017 USD ($) $ / shares shares | Apr. 26, 2019 USD ($) $ / shares shares | Apr. 29, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized compensation expense related to equity awards | $ |  |  | $ 285,000,000 |  |  | $ 285,000,000 |
Unrecognized compensation expense will be amortized on a straight-line basis over a weighted-average remaining period, in years |  |  | 2 years 1 month 6 days |  |  |  |
Stock repurchase program, authorized amount | $ |  |  | $ 13,600,000,000 |  |  | $ 13,600,000,000 |
Allocation of purchase price of share repurchases | $ |  |  | $ 2,111,000,000 | $ 794,000,000 | $ 705,000,000 |  |
Repurchase of common stock, shares |  |  | 29,000,000 | 15,000,000 | 22,000,000 | 313,000,000 |
Average price of common stock repurchased under repurchase program | $ / shares |  |  | $ 72.87 | $ 51.57 | $ 32.72 | $ 37.46 |
Aggregate purchase price of common stock authorized under repurchase program | $ |  |  | $ 2,111,000,000 | $ 794,000,000 | $ 705,000,000 | $ 11,700,000,000 |
Preferred stock, shares authorized |  |  | 5,000,000 | 5,000,000 |  | 5,000,000 |
Preferred stock, shares issued |  |  | 0 | 0 |  | 0 |
Preferred stock, shares outstanding |  |  | 0 | 0 |  | 0 |
Cash dividends declared, per common share | $ / shares |  |  | $ 1.60 | $ 0.80 | $ 0.76 |  |
Subsequent Event |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Cash dividends declared, per common share | $ / shares | $ 0.48 |  |  |  |  |  |
Cash dividend payable date | Jul. 24, 2019 |  |  |  |  |  |
Cash dividend record date | Jul. 05, 2019 |  |  |  |  |  |
Additional Paid-in Capital |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocation of purchase price of share repurchases | $ |  |  | $ 1,000,000,000 |  |  |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocation of purchase price of share repurchases | $ |  |  | $ 1,109,000,000 | $ 226,000,000 | $ 370,000,000 |  |
Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of Common stock issued to settle PBRSUs of target shares granted |  |  | 0.00% | 0.00% | 0.00% |  |
Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Percentage of Common stock issued to settle PBRSUs of target shares granted |  |  | 200.00% | 200.00% | 200.00% |  |
Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Awards outstanding |  |  | 8,000,000 | 9,000,000 | 11,000,000 | 8,000,000 | 13,000,000
Performance Based Restricted Stock Unit |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
RSUs grant date fair value | $ |  |  | $ 24,000,000 | $ 20,000,000 | $ 15,000,000 | $ 24,000,000 |
Vesting period, description |  |  | For the remaining PBRSUs granted in fiscal 2019, the number of shares issued will depend upon our achievement against a cumulative Adjusted Operating Income (AOI) target, as defined in the grant agreements, for the three-year period from fiscal 2019 through 2021. |  |  |  |
Awards outstanding |  |  | 1,000,000 | 1,000,000 |  | 1,000,000 |
Performance Based Restricted Stock Unit | PBRSU One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 2 years | 2 years | 2 years |  |
Performance Based Restricted Stock Unit | PBRSU Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 3 years | 3 years | 3 years |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Additional shares of common stock authorized |  | 2,000,000 |  |  |  |  |
Shares available for grant |  |  | 7,000,000 |  |  | 7,000,000 |
Share offering period for eligible employees |  |  | 24 months |  |  |  |
Number of consecutive purchase periods | Period |  |  | 4 |  |  |  |
Duration of purchase period |  |  | 6 months |  |  |  |
Percentage of discount from quoted market price, employees entitled to buy shares (ESPP) |  |  | 15.00% |  |  |  |
1999 Stock Option Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Decrease in number of shares reserved for issuance for every share subject to a full value award |  |  | 2 |  |  |  |
Number of shares that may be granted to a participant in any calendar year |  |  | 1,000,000 |  |  |  |
Maximum initial value of performance units a participant may receive | $ |  |  | $ 5,000,000 |  |  |  |
Number of performance shares a participant may receive in a calendar year |  |  | 1,000,000 |  |  |  |
Additional shares of common stock authorized |  |  | 9,000,000 |  |  |  |
Shares available for grant |  |  | 28,000,000 |  |  | 28,000,000 |
1999 Stock Option Plan | Stock Option |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase price of common stock, percentage |  |  | 100.00% |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
Options granted period term |  |  | 7 years |  |  |  |
1999 Stock Option Plan | Restricted Stock Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
1999 Stock Option Plan | Restricted Stock Units | Tranche One |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  | 25.00% |  |  |  |
1999 Stock Option Plan | Restricted Stock Units | Tranche Two |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  | 25.00% |  |  |  |
1999 Stock Option Plan | Restricted Stock Units | Tranche Three |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  | 25.00% |  |  |  |
1999 Stock Option Plan | Restricted Stock Units | Tranche Four |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting rate |  |  | 25.00% |  |  |  |

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