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Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 01, 2023 | Sep. 28, 2024 | Sep. 30, 2023 | Sep. 24, 2022
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 1,266.5 | $ 1,231.0 |
Less - accumulated depreciation and amortization |  | (728.7) | (714.0) |
Property, plant and equipment, net |  | 537.8 | 517.0 | $ 481.6
Impairment of intangible assets and equipment | $ 186.9 | 5.6 | 44.3 | $ 27.7
Mobidiag | Property, Plant and Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of intangible assets and equipment | 12.1 |  |  |
Ultrasound Imaging Assets | Property, Plant and Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Impairment of intangible assets and equipment | $ 5.8 |  |  |
Equipment |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 378.1 | 380.0 |
Equipment | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 3 years |  |
Equipment | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 10 years |  |
Equipment under customer usage agreements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 523.1 | 508.1 |
Equipment under customer usage agreements | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 3 years |  |
Equipment under customer usage agreements | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 8 years |  |
Buildings and improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 247.1 | 230.0 |
Buildings and improvements | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 20 years |  |
Buildings and improvements | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 35 years |  |
Leasehold improvements |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 44.0 | 44.4 |
Land |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | 40.8 | 41.1 |
Furniture and fixtures |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 24.6 | 19.2 |
Furniture and fixtures | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 5 years |  |
Furniture and fixtures | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  | 7 years |  |
Finance lease right-of-use asset |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, gross |  | $ 8.8 | $ 8.2 |

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