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Business Combination - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions			3 Months Ended			9 Months Ended
	Apr. 07, 2017	Mar. 22, 2017	Jul. 01, 2017	Jul. 01, 2017	Jun. 25, 2016	Jul. 01, 2017	Jun. 25, 2016	Jun. 22, 2017
Business Acquisition [Line Items]
Revenues				$ 806.1	$ 717.4	$ 2,255.9	$ 2,105.8
Operating Income (Loss)				115.0	$ 139.4	1,260.9	$ 401.6
Cynosure
Business Acquisition [Line Items]
Outstanding noncontrolling shares		1.2
Purchase price (in dollars per share)		$ 66.00
Cash paid		$ 1,578.6
Noncontrolling interest		79.2
Transaction costs		18.5
Revenues			$ 126.0
Operating Income (Loss)			51.4
Purchase price withheld			$ 1.5	$ 1.5		$ 1.5
Medicor Medical Supply
Business Acquisition [Line Items]
Cash paid	$ 19.0
Intangible Assets								$ 5.4
Purchase price withheld								$ 1.9
Weighted average period	7 years 8 months 12 days
In-process research and development | Cynosure
Business Acquisition [Line Items]
Intangible Assets		107.0
Estimated costs to complete		18.0
Developed technology | Cynosure
Business Acquisition [Line Items]
Intangible Assets		$ 736.0
Weighted average period		11 years 9 months 18 days
Distribution agreement | Cynosure
Business Acquisition [Line Items]
Intangible Assets		$ 42.0
Weighted average period		8 years
Customer relationships | Cynosure
Business Acquisition [Line Items]
Intangible Assets		$ 35.0
Weighted average period		7 years 8 months 12 days
Trade names | Cynosure
Business Acquisition [Line Items]
Intangible Assets		$ 74.0
Weighted average period		8 years 10 months 24 days
Minimum | Other Intangible Assets | Cynosure
Business Acquisition [Line Items]
Discount rate (as a percent)		11.00%
Minimum | In-process research and development | Cynosure
Business Acquisition [Line Items]
Discount rate (as a percent)		14.00%
Maximum | Other Intangible Assets | Cynosure
Business Acquisition [Line Items]
Discount rate (as a percent)		12.00%
Maximum | In-process research and development | Cynosure
Business Acquisition [Line Items]
Discount rate (as a percent)		22.00%
Cynosure Shareholders | Cynosure
Business Acquisition [Line Items]
Cash paid		$ 1,580.0

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