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Intangible Assets and Goodwill Additional Information (Details) - USD ($)		3 Months Ended		6 Months Ended
	Mar. 22, 2017	Mar. 31, 2018	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017	Sep. 30, 2017
Product Line [Line Items]
Goodwill impairment charge		$ 685,700,000	$ 0	$ 685,700,000	$ 0
Goodwill		2,498,200,000		2,498,200,000		$ 3,171,200,000
Cynosure
Product Line [Line Items]
Goodwill impairment charge		685,700,000
Goodwill	$ 685,700,000
Maximum | Other Intangible Assets | Cynosure
Product Line [Line Items]
Discount rate (as a percent)	12.00%
Medical Aesthetics
Product Line [Line Items]
Goodwill		$ 0		$ 0

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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