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Stockholders' Equity - Reconciliation of Retained Earnings (Accumulated Deficit) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 26, 2018 | Jan. 27, 2017 | Jan. 26, 2018 | Jan. 27, 2017
Retained Earnings Adjustments [Line Items] |  |  |  |
Beginning balance |  |  | $ 40 |
Net loss | $ (506) | $ 146 | (195) | $ 319
Repurchases of common stock |  |  | (450) |
Ending balance | $ (489) |  | (489) |
Retained Earnings |  |  |  |
Retained Earnings Adjustments [Line Items] |  |  |  |
Repurchases of common stock |  |  | (226) |
Dividends |  |  | $ (108) |

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