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Goodwill and Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) - USD ($)
$ in Millions
Apr. 27, 2018
Apr. 28, 2017
Acquired Finite Lived Intangible Assets [Line Items]    
Net Assets $ 94 $ 131
Intangible Assets Subject to Amortization    
Acquired Finite Lived Intangible Assets [Line Items]    
2019 47  
2020 31  
2021 16  
Net Assets $ 94