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Business Combinations - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Aug. 18, 2021
Aug. 17, 2021
Oct. 03, 2021
Jul. 04, 2021
Oct. 03, 2021
Sep. 27, 2020
Business Acquisition [Line Items]            
Change in fair value of contingent consideration         $ (7.0) $ 0.0
Amortization of intangible assets     $ 19.0   34.0 $ 23.0
GRAIL Inc            
Business Acquisition [Line Items]            
Business acquisition, common stock issued (in shares) 9.8          
Contingent value right, terms 12 years          
Contingent consideration liabilities     754.0   754.0  
Contingent consideration, noncurrent     753.0   753.0  
Change in fair value of contingent consideration     8.0      
Equity ownership percentage 12.00%          
Equity investment $ 1,200.0          
Gain recognized on equity investment     900.0      
Purchase price related to fair value of equity awards attributable to pre-combination service 69.0          
Share-based payment arrangement, accelerated cost     615.0      
Fair value of replacement awards $ 48.0          
Share price (in dollars per share) $ 510.61          
Weighted average risk free interest rate minimum 0.17%          
Weighted average risk free interest rate maximum 0.28%          
Expected volatility, minimum 40.00%          
Expected volatility, maximum 43.00%          
Expected dividends 0.00%          
Weighted average acquisition-date fair value per share (in dollars per share) $ 424.39          
Acquisition related costs     66.0   156.0  
Business combination, continuation payments   $ 35.0        
GRAIL Inc | Minimum            
Business Acquisition [Line Items]            
Expected term 1 year 7 months 6 days          
GRAIL Inc | Maximum            
Business Acquisition [Line Items]            
Expected term 2 years 2 months 12 days          
GRAIL Inc | Selling, general and administrative            
Business Acquisition [Line Items]            
Business combination, continuation payments     35.0   245.0  
GRAIL Inc | Payment Rights Of One Billion, Each Twelve Years            
Business Acquisition [Line Items]            
Contingent payment rights, percentage 2.50%          
Business acquisition, contingent value rights, revenue threshold $ 1,000.0          
GRAIL Inc | Payment Rights Of Above One Billion, Each Twelve Years            
Business Acquisition [Line Items]            
Business acquisition, contingent value rights, revenue threshold $ 1,000.0          
Contingent payment rights, second percentage 9.00%          
Series of Individually Immaterial Business Acquisitions            
Business Acquisition [Line Items]            
Contingent consideration liabilities     15.0 $ 14.0 15.0  
Change in fair value of contingent consideration     (1.0)   $ (1.0)  
Series of Individually Immaterial Business Acquisitions | In-process research and development (IPR&D)            
Business Acquisition [Line Items]            
Indefinite lived intangible assets acquired       $ 35.0    
Series of Individually Immaterial Business Acquisitions | Developed technology            
Business Acquisition [Line Items]            
Finite-lived intangible assets acquired     $ 28.0      
Finite-lived intangible asset, useful life     10 years