Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($)	3 Months Ended				12 Months Ended
	Sep. 26, 2020	Mar. 28, 2020	Dec. 28, 2019	Mar. 30, 2019	Sep. 28, 2019	Oct. 01, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 4,931,100,000				$ 4,786,600,000
Accumulated Amortization	3,623,600,000				3,326,800,000
Impairment charge			$ 30,200,000	$ 685,400,000
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,054,000,000.0				3,927,700,000
Accumulated Amortization	2,907,200,000				2,654,800,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	549,100,000				525,500,000
Accumulated Amortization	477,800,000				447,500,000
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	245,500,000				245,400,000
Accumulated Amortization	181,200,000				171,100,000
Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	0				2,500,000
Accumulated Amortization	0				0
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,500,000				1,400,000
Accumulated Amortization	1,300,000				900,000
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2,400,000				2,300,000
Accumulated Amortization	2,300,000				2,200,000
Acquired intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,852,500,000				4,704,800,000
Accumulated Amortization	3,569,800,000				3,276,500,000
Internal-use software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	51,800,000				53,900,000
Accumulated Amortization	43,200,000				43,400,000
Capitalized software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	26,800,000				27,900,000
Accumulated Amortization	10,600,000				6,900,000
Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Impairment charge		$ 30,200,000
Medical Aesthetics | Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charge	576,900,000	24,100,000
Medical Aesthetics | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Impairment charge	22,400,000	900,000
Medical Aesthetics | Trade names
Finite-Lived Intangible Assets [Line Items]
Impairment charge	48,600,000	$ 2,000,000.0
Medical Aesthetics | Property, Plant and Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charge	9,800,000
Focal Therapeutics | Developed technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						$ 83,100,000
Focal Therapeutics | In-process research and development
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						11,400,000
In process research and development reclassified to developed technology					$ 5,500,000
Focal Therapeutics | Trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:						$ 2,700,000
Acessa Health [Member] | Developed technology
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:	127,000,000.0
Acessa Health [Member] | Trade names
Finite-Lived Intangible Assets [Line Items]
Identifiable intangible assets:	$ 1,200,000