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Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 28, 2016 | Jul. 29, 2016 | Oct. 30, 2015 | Oct. 28, 2016 | Oct. 30, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Provision for income taxes | $ 33 |  | $ 30 | $ 61 | $ 38
Accounting Standards Update 2016-09 |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Provision for income taxes |  |  |  | $ 17 |
Accounting Standards Update 2016-09 | Account for Forfeitures As Occur |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect impact to retained earnings |  | $ 7 |  |  |
Accounting Standards Update 2016-09 | Forfeiture Rate Policy Change On Outstanding Stock Based Awards |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment to retained earnings |  | (3) |  |  |
Accounting Standards Update 2016-09 | Previously Unrecognized Tax Benefits |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |
Cumulative-effect adjustment to retained earnings |  | $ 17 |  |  |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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