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Stockholders' Equity - Summary of Activities Related to Dividends on Common Stock (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 26, 2018 | Jan. 27, 2017 | Jan. 26, 2018 | Jan. 27, 2017
Dividends, Common Stock [Abstract] |  |  |  |
Dividends per share declared | $ 0.20 | $ 0.19 | $ 0.60 | $ 0.57
Dividend payments |  |  | $ 161 | $ 157
Additional Paid-in Capital |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |
Dividend payments |  |  | 53 | 88
Retained Earnings (Accumulated Deficit) |  |  |  |
Dividends, Common Stock [Abstract] |  |  |  |
Dividend payments |  |  | $ 108 | $ 69

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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