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Summary of Significant Accounting Policies - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 28, 2019	Mar. 30, 2019	Mar. 31, 2018	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017	Oct. 01, 2018
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets and equipment	$ 241.6	$ 443.8	$ 46.0	$ 106.7	$ 46.0	$ 0.0
Gross Carrying Value	4,786.6			4,786.6	5,571.8
Accumulated Amortization	3,326.8			3,326.8	3,173.2
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	3,927.7			3,927.7	4,573.3
Accumulated Amortization	2,654.8			2,654.8	2,505.8
In-process research and development
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	0.0			0.0	5.5
Accumulated Amortization	0.0			0.0	0.0
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	525.5			525.5	556.5
Accumulated Amortization	447.5			447.5	428.1
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	245.4			245.4	312.5
Accumulated Amortization	171.1			171.1	175.0
Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.5			2.5	42.0
Accumulated Amortization	0.0			0.0	8.0
Non-competition agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1.4			1.4	1.5
Accumulated Amortization	0.9			0.9	0.5
Business licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	2.3			2.3	2.4
Accumulated Amortization	2.2			2.2	2.2
Acquired intangible assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	4,704.8			4,704.8	5,493.7
Accumulated Amortization	3,276.5			3,276.5	3,119.6
Internal-use software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	53.9			53.9	58.5
Accumulated Amortization	43.4			43.4	49.3
Capitalized software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	27.9			27.9	19.6
Accumulated Amortization	6.9			6.9	$ 4.3
Medical Aesthetics | Distribution agreement
Finite-Lived Intangible Assets [Line Items]
Impairment charge	27.7
Medical Aesthetics | Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charge	576.9
Medical Aesthetics | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Impairment charge	22.4
Medical Aesthetics | Trade names
Finite-Lived Intangible Assets [Line Items]
Impairment charge	48.6
Medical Aesthetics | Property, Plant and Equipment [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment charge	$ 9.8
Focal Therapeutics | Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets							$ 83.1
Focal Therapeutics | In-process research and development
Finite-Lived Intangible Assets [Line Items]
Intangible assets							11.4
In process research and development reclassified to developed technology				$ 5.5
Focal Therapeutics | Trade names
Finite-Lived Intangible Assets [Line Items]
Intangible assets							$ 2.7

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