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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 25, 2021	Dec. 26, 2020	Dec. 28, 2019	Mar. 30, 2019	Sep. 28, 2019	Jun. 26, 2021	Mar. 27, 2021	Sep. 26, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 5,582,100,000							$ 4,931,100,000
Accumulated Amortization	3,922,900,000							3,623,600,000
Impairment charge	1,800,000	$ 30,200,000	$ 30,200,000	$ 685,400,000
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,597,700,000							4,054,000,000
Accumulated Amortization	3,184,200,000							2,907,200,000
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	71,600,000							0
Accumulated Amortization	0							0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	591,700,000							549,100,000
Accumulated Amortization	510,100,000							477,800,000
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	268,100,000							245,500,000
Accumulated Amortization	191,800,000							181,200,000
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,500,000							1,500,000
Accumulated Amortization	1,500,000							1,300,000
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,500,000							2,400,000
Accumulated Amortization	2,500,000							2,300,000
Acquired intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	5,533,100,000							4,852,500,000
Accumulated Amortization	3,890,100,000							3,569,800,000
Internal-use software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	23,500,000							51,800,000
Accumulated Amortization	17,200,000							43,200,000
Capitalized software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	25,500,000							26,800,000
Accumulated Amortization	$ 15,600,000							10,600,000
Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Impairment charge			$ 30,200,000
Medical Aesthetics | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Impairment charge					$ 576,900,000
Medical Aesthetics | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Impairment charge					22,400,000
Medical Aesthetics | Trade names
Finite-Lived Intangible Assets [Line Items]
Impairment charge					48,600,000
Medical Aesthetics | Property, Plant and Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charge					$ 9,800,000
Mobidiag Oy | In-process research and development
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						$ 74,000,000
Mobidiag Oy | Trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						20,000,000
Mobidiag Oy | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						20,900,000
Mobidiag Oy | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						$ 285,000,000
Biotheranostics | Trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							$ 2,100,000
Biotheranostics | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							160,300,000
Diagenode | Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							9,200,000
Diagenode | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							69,800,000
Somatex | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							1,200,000
Somatex | Trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							900,000
Somatex | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:							$ 38,000,000
Acessa Health | Trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:								1,200,000
Acessa Health | Developed Technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:								$ 127,000,000

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