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Business Segments and Geographic Information - Segment Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 01, 2023
Mar. 26, 2022
Apr. 01, 2023
Mar. 26, 2022
Sep. 24, 2022
Segment Reporting Information [Line Items]          
Total revenues $ 1,026.5 $ 1,435.7 $ 2,100.7 $ 2,906.9  
Income (loss) from operations 272.1 594.1 534.5 1,235.4  
Depreciation and amortization 80.8 106.1 166.7 214.1  
Capital expenditures 32.1 32.3 61.2 69.9  
Identifiable assets 9,448.7   9,448.7   $ 9,071.2
Diagnostics          
Segment Reporting Information [Line Items]          
Total revenues 464.7 987.1 1,024.0 1,937.5  
Income (loss) from operations 105.3 540.6 256.4 1,072.4  
Depreciation and amortization 56.1 68.2 116.0 137.6  
Capital expenditures 20.2 26.5 36.1 57.5  
Identifiable assets 2,940.4   2,940.4   2,881.7
Breast Health          
Segment Reporting Information [Line Items]          
Total revenues 385.4 310.4 719.5 669.9  
Income (loss) from operations 109.9 49.3 170.4 131.0  
Depreciation and amortization 12.9 13.1 26.5 28.6  
Capital expenditures 6.9 2.8 14.1 7.0  
Identifiable assets 1,250.9   1,250.9   1,245.8
GYN Surgical          
Segment Reporting Information [Line Items]          
Total revenues 144.8 117.3 298.9 251.6  
Income (loss) from operations 52.3 5.7 101.0 32.3  
Depreciation and amortization 11.6 24.6 23.9 47.5  
Capital expenditures 2.8 2.0 6.7 4.1  
Identifiable assets 1,464.2   1,464.2   1,461.5
Skeletal Health          
Segment Reporting Information [Line Items]          
Total revenues 31.6 20.9 58.3 47.9  
Income (loss) from operations 4.6 (1.5) 6.7 (0.3)  
Depreciation and amortization 0.2 0.2 0.3 0.4  
Capital expenditures 0.1 0.1 0.2 0.2  
Identifiable assets 22.7   22.7   27.5
Corporate          
Segment Reporting Information [Line Items]          
Capital expenditures 2.1 $ 0.9 4.1 $ 1.1  
Identifiable assets $ 3,770.5   $ 3,770.5   $ 3,454.7