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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 26, 2020
Dec. 28, 2019
Mar. 27, 2021
Mar. 28, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Intangible asset and equipment impairment charges   $ 30.2 $ 0.0 $ 30.2
Borrowed principal     1,000.0  
Credit Agreement        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Borrowed principal     1,400.0  
2025 Senior Notes        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Fair value of debt instrument     421.7  
2028 Senior Notes        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Fair value of debt instrument     $ 932.2  
Medical Aesthetics        
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]        
Intangible asset and equipment impairment charges $ 30.2