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Business Combination - Narrative (Details)
 3 Months Ended 9 Months Ended
Jul. 31, 2018
USD ($)
Dec. 11, 2017
USD ($)
Apr. 07, 2017
USD ($)
Mar. 22, 2017
USD ($)
project
$ / shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jul. 01, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Sep. 30, 2017
USD ($)
project
Business Acquisition [Line Items]                      
Gross Carrying Value         $ 5,530,000,000       $ 5,530,000,000   $ 5,562,500,000
Goodwill impairment charge         0   $ 0   685,700,000 $ 0  
Revenues         824,000,000   806,100,000   2,404,500,000 2,255,900,000  
Income (loss) from operations         133,100,000   $ 115,000,000   (336,900,000) $ 1,260,900,000  
Goodwill         2,493,400,000       2,493,400,000   3,171,200,000
Cynosure                      
Business Acquisition [Line Items]                      
Purchase price (in dollars per share) | $ / shares       $ 66.00              
Transaction costs       $ 18,800,000              
Revenues               $ 126,000,000      
Income (loss) from operations               $ 51,400,000      
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   $ 4,600,000                  
Purchase price withheld   $ 500,000     4,900,000       4,900,000    
Period for payment of contingent consideration liabilities   18 months                  
Goodwill         5,700,000       5,700,000    
Property, plant and equipment         6,000,000       6,000,000    
Consideration transferred   $ 16,300,000                  
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         $ 310,300,000       $ 310,300,000   $ 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              
Subsequent Event | Faxitron [Member]                      
Business Acquisition [Line Items]                      
Consideration transferred $ 85,000,000