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Business Combinations - Fair Values of Net Assets Acquired (Detail) - USD ($) $ in Millions | Apr. 28, 2017 | Apr. 29, 2016 | Apr. 24, 2015
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 1,684 | $ 1,676 | $ 1,027
Fiscal 2015 Acquisitions |  |  |
Business Acquisition [Line Items] |  |  |
Net tangible assets |  |  | 14
Finite-lived intangible assets |  |  | 32
Goodwill |  |  | 39
Total purchase price |  |  | $ 85

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