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Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 29, 2016 | Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Provision for income taxes |  | $ 156 | $ 116 | $ 153
Minimum | Software maintenance and Hardware maintenance services |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Maintenance contractual term |  | 1 year |  |
Minimum | Developed Technology |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years |  |
Minimum | Customer Contracts/Relationships |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 2 years |  |
Minimum | Covenants not to Compete |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 2 years |  |
Minimum | Trademarks and Trade Names |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 2 years |  |
Maximum | Software maintenance and Hardware maintenance services |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Maintenance contractual term |  | 5 years |  |
Maximum | Developed Technology |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 6 years |  |
Maximum | Customer Contracts/Relationships |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 8 years |  |
Maximum | Covenants not to Compete |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 3 years |  |
Maximum | Trademarks and Trade Names |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  | 7 years |  |
Accounting Standards Update 2016-09 |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Provision for income taxes |  | $ 18 |  |
Accounting Standards Update 2016-09 | Account for Forfeitures As Occur |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect impact to retained earnings | $ 7 |  |  |
Accounting Standards Update 2016-09 | Forfeiture Rate Policy Change On Outstanding Stock Based Awards |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect adjustment to retained earnings | (3) |  |  |
Accounting Standards Update 2016-09 | Previously Unrecognized Tax Benefits |  |  |  |
Description Of Business And Significant Accounting Policies [Line Items] |  |  |  |
Cumulative-effect adjustment to retained earnings | $ 17 |  |  |

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- Definition Amount of the cumulative effect on retained earnings before related income tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22663-107794 + Details
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