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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 30, 2023
Dec. 28, 2024
Mobidiag | Right of use asset    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Intangible asset impairment charge $ 12.5  
In-process research and development | Mobidiag    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Intangible asset impairment charge 4.3  
Intangible assets, current $ 22.4  
2028 Senior Notes    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of debt instrument   $ 387.4
2029 Senior Notes    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value of debt instrument   860.9
Credit Agreement    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Borrowed principal   $ 1,200.0
2028 Senior Notes | Senior Notes    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Stated interest rate   4.625%
2029 Senior Notes | Senior Notes    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Stated interest rate   3.25%