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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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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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