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Business Segments and Geographic Information - Segment Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Sep. 29, 2018
Segment Reporting Information [Line Items]      
Total revenues $ 830.7 $ 791.1  
Income (loss) from operations 140.5 134.1  
Depreciation and amortization 118.8 121.2  
Capital expenditures 22.6 21.8  
Identifiable assets 6,931.5   $ 7,230.9
Diagnostics      
Segment Reporting Information [Line Items]      
Total revenues 296.6 284.6  
Income (loss) from operations 43.3 36.5  
Depreciation and amortization 61.8 64.7  
Capital expenditures 14.4 11.9  
Identifiable assets 2,405.3   2,442.9
Breast Health      
Segment Reporting Information [Line Items]      
Total revenues 324.7 288.0  
Income (loss) from operations 97.8 89.7  
Depreciation and amortization 9.3 4.9  
Capital expenditures 2.1 3.5  
Identifiable assets 1,122.5   972.4
Medical Aesthetics      
Segment Reporting Information [Line Items]      
Total revenues 79.8 91.3  
Income (loss) from operations (25.2) (23.0)  
Depreciation and amortization 25.5 28.5  
Capital expenditures 1.1 1.6  
Identifiable assets 895.1   913.3
GYN Surgical      
Segment Reporting Information [Line Items]      
Total revenues 108.4 107.5  
Income (loss) from operations 27.0 30.2  
Depreciation and amortization 22.0 22.9  
Capital expenditures 3.5 2.4  
Identifiable assets 1,382.4   1,414.9
Skeletal Health      
Segment Reporting Information [Line Items]      
Total revenues 21.2 19.7  
Income (loss) from operations (2.4) 0.7  
Depreciation and amortization 0.2 0.2  
Capital expenditures 0.3 0.7  
Identifiable assets 31.6   30.3
Corporate      
Segment Reporting Information [Line Items]      
Capital expenditures 1.2 $ 1.7  
Identifiable assets $ 1,094.6   $ 1,457.1