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Business Combination - Narrative (Details)
 3 Months Ended 6 Months Ended
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