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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Mar. 30, 2024	Dec. 30, 2023	Apr. 01, 2023	Mar. 30, 2024	Apr. 01, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Intangible asset impairment charges				$ 31.1	$ 0.0
Impairment of intangible assets	$ 0.9		$ 0.0	5.2	$ 0.0
Mobidiag \| Right of use asset
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Intangible asset impairment charges		$ 12.5
In-process research and development \| Mobidiag
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Intangible asset impairment charges		4.3
Intangible Assets, Current	22.4			22.4
Impairment of intangible assets		$ 4.3
Developed technology
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment of intangible assets	25.9
Finite-Lived Intangible Assets, Net	13.9			13.9
Trade Names
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment of intangible assets	0.9
Finite-Lived Intangible Assets, Net	0.5			0.5
2028 Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument	385.9			385.9
2029 Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument	852.6			852.6
Credit Agreement
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Borrowed principal	$ 1,200.0			$ 1,200.0
2028 Senior Notes \| Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Stated interest rate	4.625%			4.625%
2029 Senior Notes \| Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Stated interest rate	3.25%			3.25%