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Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended						12 Months Ended
	Sep. 30, 2023	Jul. 01, 2023	Sep. 24, 2022	Jun. 25, 2022	Mar. 26, 2022	Sep. 25, 2021	Sep. 30, 2023	Sep. 24, 2022	Sep. 25, 2021	Jul. 02, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Investments, fair value	$ 35,300,000		$ 65,300,000				$ 35,300,000	$ 65,300,000
Impairment charge		$ 186,900,000
Loss on assets held-for-sale	51,700,000						51,700,000	0	$ 0
Property, plant and equipment, net	517,000,000.0		481,600,000			$ 564,700,000	517,000,000.0	481,600,000	564,700,000
Impairment of intangible assets and equipment		174,800,000					44,300,000	27,700,000	$ 0
ultrasound imaging assets
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge		26,400,000
ultrasound imaging assets, developed technology
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge		20,600,000
ultrasound imaging assets, equipment
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge		5,800,000
In Process Research and Development [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge		10,500,000	27,700,000
Developed Technology Rights [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge			8,200,000	$ 9,200,000
Equity Securities, Investment Summary
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge			4,000,000		$ 4,300,000	$ 1,800,000
Finite-Lived Intangible Assets
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Finite-Lived Intangible Assets, Net		65,800,000								$ 0
Property, Plant and Equipment [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment charge		12,100,000
Property, plant and equipment, net		4,600,000
Indefinite-Lived Intangible Assets
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 26,500,000
Credit Agreement
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Borrowed principal under credit agreement	1,490,000,000						1,490,000,000
Significant Unobservable Inputs (Level 3)
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Investments, fair value	0		$ 0				0	$ 0
2028 Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument	368,000,000						368,000,000
2029 Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument	$ 803,100,000						$ 803,100,000