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Business Segments and Geographic Information - Segment Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Sep. 30, 2017
Segment Reporting Information [Line Items]      
Total revenues $ 791.1 $ 734.4  
Operating income (loss) 134.1 146.0  
Depreciation and amortization 121.2 115.3  
Capital expenditures 21.8 24.7  
Identifiable assets 8,048.3   $ 7,979.6
Diagnostics      
Segment Reporting Information [Line Items]      
Total revenues 284.6 325.4  
Operating income (loss) 36.5 41.1  
Depreciation and amortization 64.7 84.9  
Capital expenditures 11.9 10.3  
Identifiable assets 2,583.0   2,621.6
Breast Health      
Segment Reporting Information [Line Items]      
Total revenues 288.0 273.3  
Operating income (loss) 89.7 85.2  
Depreciation and amortization 4.9 5.1  
Capital expenditures 3.5 2.2  
Identifiable assets 840.5   824.0
GYN Surgical      
Segment Reporting Information [Line Items]      
Total revenues 107.5 114.8  
Operating income (loss) 30.2 25.5  
Depreciation and amortization 22.9 25.1  
Capital expenditures 2.4 4.1  
Identifiable assets 1,477.8   1,494.6
Skeletal Health      
Segment Reporting Information [Line Items]      
Total revenues 19.7 20.9  
Operating income (loss) 0.7 (5.8)  
Depreciation and amortization 0.2 0.2  
Capital expenditures 0.7 0.3  
Identifiable assets 26.8   25.5
Medical Aesthetics      
Segment Reporting Information [Line Items]      
Total revenues 91.3 0.0  
Operating income (loss) (23.0) 0.0  
Depreciation and amortization 28.5 0.0  
Capital expenditures 1.6 0.0  
Identifiable assets 1,723.9   1,751.2
Corporate      
Segment Reporting Information [Line Items]      
Capital expenditures 1.7 $ 7.8  
Identifiable assets $ 1,396.3   $ 1,262.7