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Net Income per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended
Jul. 31, 2020
Jul. 26, 2019
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Outstanding employee equity awards excluded from diluted net income per share calculations 6  
Maximum    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Outstanding employee equity awards excluded from diluted net income per share calculations   1