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Business Acquisitions (Details)
$ in Millions
12 Months Ended
Sep. 30, 2015
USD ($)
Mar. 15, 2016
USD ($)
Sep. 15, 2015
Business Combination, Additional Disclosures [Abstract]      
Consideration transferred $ 18.6    
Business acquisitions in the current period 7.1    
Goodwill 585.9    
Net income $ 186.2    
Dental Marketing Services and Software Company      
Business Acquisition, Entity Acquired And Reason For Acquisition [Abstract]      
Business Acquisition, Percentage of Voting Interests Acquired 100.00%    
Business Combination, Additional Disclosures [Abstract]      
Consideration transferred $ 18.6    
Goodwill 12.9    
Revenues 11.3    
Net income $ 0.2    
DENTSPLY [Member] | Common Stock [Member]      
Business Combination, Additional Disclosures [Abstract]      
Dentsply Common Stock Conversion Ratio     1.8142
DENTSPLY [Member] | Forecast [Member] | Termination Fees [Member]      
Business Combination, Additional Disclosures [Abstract]      
Contingent Fee   $ 205.0  
DENTSPLY [Member] | Forecast [Member] | Termination Fees [Member] | DENTSPLY [Member]      
Business Combination, Additional Disclosures [Abstract]      
Contingent Fee   280.0  
DENTSPLY [Member] | Forecast [Member] | Acquisition-related Costs [Member]      
Business Combination, Additional Disclosures [Abstract]      
Contingent Fee   15.0  
DENTSPLY [Member] | Forecast [Member] | Acquisition-related Costs [Member] | DENTSPLY [Member]      
Business Combination, Additional Disclosures [Abstract]      
Contingent Fee   $ 15.0