Intangible Assets and Goodwill -Narrative (Details) - USD ($)	3 Months Ended				9 Months Ended
	Jun. 29, 2019	Mar. 30, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 29, 2019	Jun. 30, 2018	Sep. 29, 2018	Jul. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges	$ 443,800,000	$ 443,800,000			$ 443,800,000	$ 46,000,000.0
Goodwill impairment charge	0		$ 0		0	$ 685,700,000
Goodwill	2,566,400,000				2,566,400,000		$ 2,533,200,000
Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges				$ 443,800,000
Impairment discount rate				11.00%
Goodwill impairment charge				$ 685,700,000
Goodwill	0				$ 0
Developed technology | Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges				373,300,000
Customer relationships | Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges				14,400,000
Trade names | Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges				31,500,000
Distribution agreement | Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges				17,800,000
Property, Plant and Equipment
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges		6,800,000
Property, Plant and Equipment | Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Intangible asset and equipment impairment charges				$ 6,800,000
Goodwill | Medical Aesthetics
Finite-Lived Intangible Assets [Line Items]
Impairment discount rate				12.00%
Faxitron
Finite-Lived Intangible Assets [Line Items]
Research and Development in Process	$ 2,900,000	$ 2,600,000
Goodwill								$ 45,600,000