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Business Segments and Geographic Information - Segment Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Segment Reporting Information [Line Items]      
Revenues $ 4,030.4 $ 4,862.8 $ 5,632.3
Operating income 668.4 1,640.2 2,480.3
Depreciation and amortization 323.4 430.1 406.9
Capital expenditures 150.2 127.2 177.7
Identifiable assets 9,139.3 9,071.2 8,919.9
Diagnostics      
Segment Reporting Information [Line Items]      
Revenues 1,880.1 3,018.5 3,695.0
Operating income 193.9 1,359.4 2,140.1
Depreciation and amortization 224.7 274.0 260.4
Capital expenditures 85.2 96.8 147.7
Identifiable assets 2,596.4 2,881.7 3,348.8
Breast Health      
Segment Reporting Information [Line Items]      
Revenues 1,432.7 1,227.8 1,352.3
Operating income 273.0 183.2 284.2
Depreciation and amortization 50.0 58.8 52.7
Capital expenditures 41.1 14.6 14.2
Identifiable assets 1,170.1 1,245.8 1,233.9
Gyn Surgical [Member]      
Segment Reporting Information [Line Items]      
Revenues 604.2 522.9 488.1
Operating income 188.9 104.9 58.9
Depreciation and amortization 48.0 96.6 93.1
Capital expenditures 17.0 12.8 14.5
Identifiable assets 1,455.4 1,461.5 1,369.7
Skeletal Health      
Segment Reporting Information [Line Items]      
Revenues 113.4 93.6 96.9
Operating income 12.6 (7.3) (2.9)
Depreciation and amortization 0.7 0.7 0.7
Capital expenditures 0.8 0.3 0.3
Identifiable assets 33.7 27.5 31.9
Corporate and Other      
Segment Reporting Information [Line Items]      
Capital expenditures 6.1 2.7 1.0
Identifiable assets $ 3,883.7 $ 3,454.7 $ 2,935.6