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Acquisitions and Divestitures - Additional Information (Details)
9 Months Ended 12 Months Ended
Apr. 25, 2020
USD ($)
acquisition
Apr. 27, 2019
USD ($)
Jul. 25, 2020
USD ($)
Business Acquisition [Line Items]      
Number of acquisitions | acquisition 5    
Acquired cash and cash equivalents $ 16,000,000    
Goodwill, expected tax deductible 0    
Acacia Communications, Inc. | Forecast      
Business Acquisition [Line Items]      
Payment consideration to acquire business, net of cash and marketable securities     $ 2,600,000,000
General and administrative      
Business Acquisition [Line Items]      
Acquisition related costs $ 13,000,000 $ 15,000,000