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Acquisitions and Divestitures - Additional Information (Details)
6 Months Ended
Jul. 25, 2020
USD ($)
Jan. 25, 2020
USD ($)
acquisition
Jan. 26, 2019
USD ($)
Business Acquisition [Line Items]      
Number of acquisitions | acquisition   4  
Acquired cash and cash equivalents   $ 10,000,000  
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   $ 9,000,000 $ 11,000,000