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Financing Arrangements - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 28, 2017 USD ($) Extension | Jul. 26, 2019 USD ($) | Apr. 26, 2019 USD ($)
Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, amount | $ 1,000,000,000.0 |  |
Credit facility, date expiry | Dec. 10, 2021 |  |
Credit facility, increase in facility | $ 300,000,000 |  |
Credit facility, number of extensions | Extension | 2 |  |
Credit facility, extensions period | 1 year |  |
Credit facility, amounts drawn |  | $ 0 |
Revolving Credit Facility | Letter Of Credit Sub Facility |  |  |
Debt Instrument [Line Items] |  |  |
Credit facility, amount | $ 50,000,000 |  |
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount |  | 1,550,000,000 | $ 1,550,000,000
Senior Notes | Due September 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount |  | $ 400,000,000 | 400,000,000
Notes issued, interest rate |  | 2.00% |
Senior Notes | Due June 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount |  | $ 500,000,000 | 500,000,000
Notes issued, interest rate |  | 3.375% |
Senior Notes | Due September 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount |  | $ 400,000,000 | 400,000,000
Notes issued, interest rate |  | 3.30% |
Senior Notes | Due December 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount |  | $ 250,000,000 | 250,000,000
Notes issued, interest rate |  | 3.25% |
Commercial Paper |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount |  | $ 30,000,000 | $ 249,000,000
Debt instrument maturity period |  | 29 days |
Weighted-average interest rate |  | 2.56% | 2.73%
Commercial Paper | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Notes issued, principal amount | $ 1,000,000,000.0 |  |
Debt instrument maturity period | 397 days |  | 38 days
Commercial Paper | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument maturity period |  |  | 27 days

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