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Goodwill and Purchased Intangible Assets, Net - Future Amortization Expense Related to Purchased Intangible Assets (Detail) - USD ($)
$ in Millions
Apr. 30, 2021
Apr. 24, 2020
Acquired Finite Lived Intangible Assets [Line Items]    
Net Assets $ 101 $ 44
Intangible Assets Subject to Amortization    
Acquired Finite Lived Intangible Assets [Line Items]    
2022 36  
2023 29  
2024 17  
2025 16  
2026 3  
Net Assets $ 101