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Business Combination - Narrative (Details) |  |  |  | 3 Months Ended | 6 Months Ended |
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Dec. 11, 2017 USD ($) | Apr. 07, 2017 USD ($) | Mar. 22, 2017 USD ($) project $ / shares | Mar. 31, 2018 USD ($) | Jul. 01, 2017 USD ($) | Apr. 01, 2017 USD ($) | Mar. 31, 2018 USD ($) | Apr. 01, 2017 USD ($) | Sep. 30, 2017 USD ($) project
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gross Carrying Value |  |  |  | $ 5,529,900,000 |  |  | $ 5,529,900,000 |  | $ 5,562,500,000
Goodwill impairment charge |  |  |  | 685,700,000 |  | $ 0 | 685,700,000 | $ 0 |
Revenues |  |  |  | 789,300,000 |  | 715,400,000 | 1,580,400,000 | 1,449,800,000 |
Operating Income (Loss) |  |  |  | (604,200,000) |  | $ 999,800,000 | (470,100,000) | $ 1,145,800,000 |
Goodwill |  |  |  | 2,498,200,000 |  |  | 2,498,200,000 |  | 3,171,200,000
Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Purchase price (in dollars per share) | $ / shares |  |  | $ 66.00 |  |  |  |  |  |
Transaction costs |  |  | $ 18,800,000 |  |  |  |  |  |
Goodwill impairment charge |  |  |  | 685,700,000 |  |  |  |  |
Revenues |  |  |  |  | $ 207,500,000 |  |  |  |
Operating Income (Loss) |  |  |  |  | $ 96,400,000 |  |  |  |
Goodwill |  |  | 685,700,000 |  |  |  |  |  |
Property, plant and equipment |  |  | 44,100,000 |  |  |  |  |  |
Medicor Medical Supply |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash paid |  | $ 19,000,000 |  |  |  |  |  |  |
Acquisition price adjustment |  | 2,000,000 |  |  |  |  |  |  |
Intangible Assets |  | $ 5,400,000 |  |  |  |  |  |  |
Weighted average period |  | 7 years 8 months 12 days |  |  |  |  |  |  |
Purchase price withheld |  | $ 1,900,000 |  |  |  |  |  |  |
Period for payment of contingent consideration liabilities |  | 2 years |  |  |  |  |  |  |
Goodwill |  | $ 8,900,000 |  |  |  |  |  |  |
Property, plant and equipment |  | $ 4,700,000 |  |  |  |  |  |  |
Emsor |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible Assets | $ 4,100,000 |  |  |  |  |  |  |  |
Purchase price withheld | $ 500,000 |  |  | 4,100,000 |  |  | 4,100,000 |  |
Period for payment of contingent consideration liabilities | 18 months |  |  |  |  |  |  |  |
Goodwill |  |  |  | 5,200,000 |  |  | 5,200,000 |  |
Property, plant and equipment |  |  |  | 6,000,000 |  |  | 6,000,000 |  |
Consideration transferred | $ 15,400,000 |  |  |  |  |  |  |  |
Period of cumulative revenue to trigger payment of contingent consideration liability | 2 years |  |  |  |  |  |  |  |
In-process research and development |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gross Carrying Value |  |  |  | $ 0 |  |  | 0 |  | $ 46,000,000
In-process research and development | Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | $ 107,000,000 |  |  |  |  |  |
Number of projects | project |  |  | 3 |  |  |  |  |  | 2
Estimated costs to complete |  |  | $ 18,000,000 |  |  |  |  |  |
Developed technology | Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | $ 736,000,000 |  |  |  |  |  |
Gross Carrying Value |  |  |  |  |  |  |  |  | $ 61,000,000
Impaired Intangible Asset, Description |  |  |  | 46.0 |  |  |  |  |
Weighted average period |  |  | 11 years 9 months 18 days |  |  |  |  |  |
Distribution agreement |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gross Carrying Value |  |  |  | $ 42,000,000 |  |  | 42,000,000 |  | 42,000,000
Distribution agreement | Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | $ 42,000,000 |  |  |  |  |  |
Weighted average period |  |  | 8 years |  |  |  |  |  |
Customer relationships | Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | $ 35,000,000 |  |  |  |  |  |
Weighted average period |  |  | 7 years 8 months 12 days |  |  |  |  |  |
Trade names |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Gross Carrying Value |  |  |  | 310,400,000 |  |  | $ 310,400,000 |  | $ 310,300,000
Trade names | Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Intangible Assets |  |  | $ 74,000,000 |  |  |  |  |  |
Weighted average period |  |  | 8 years 10 months 24 days |  |  |  |  |  |
Goodwill [Member] | Cynosure |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  | $ 685,700,000.0 |  |  |  |  |
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 |  |  | $ 1,660,000,000 |  |  |  |  |  |

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