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Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipments (Detail) - USD ($) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 15, 2020 | Sep. 28, 2020 | Sep. 30, 2023 | Jul. 01, 2023 | Apr. 01, 2023 | Sep. 30, 2023 | Sep. 24, 2022 | Sep. 25, 2021
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Manufacturing Equipment And Software |  |  | $ 380,000,000.0 |  |  | $ 380,000,000.0 | $ 394,800,000 |
Equipment Under Customer Usage Agreements |  |  | 508,100,000 |  |  | 508,100,000 | 486,500,000 |
Buildings and Improvements, Gross |  |  | 230,000,000.0 |  |  | 230,000,000.0 | 196,000,000.0 |
Leasehold Improvements, Gross |  |  | 44,400,000 |  |  | 44,400,000 | 44,800,000 |
Land |  |  | 41,100,000 |  |  | 41,100,000 | 40,900,000 |
Furniture and Fixtures, Gross |  |  | 19,200,000 |  |  | 19,200,000 | 16,700,000 |
Finance Lease, Right-of-Use Asset |  |  | 8,200,000 |  |  | 8,200,000 | 7,500,000 |
Property, Plant and Equipment, Gross |  |  | 1,231,000,000 |  |  | 1,231,000,000 | 1,187,200,000 |
Less - accumulated depreciation and amortization |  |  | (714,000,000.0) |  |  | (714,000,000.0) | (705,600,000) |
Property, plant and equipment, net |  |  | 517,000,000.0 |  |  | 517,000,000.0 | 481,600,000 | $ 564,700,000
Grants received from Department of defense | $ 119,300,000 | $ 7,600,000 |  |  |  |  |  |
Department of defense funds received |  |  |  |  |  |  | 75,000,000 | 21,500,000
Department of Defense funds received, not capitalized |  |  |  |  |  | 7,600,000 | 1,300,000 |
Proceeds received from government grants for capacity expansion |  |  |  |  | $ 20,500,000 | $ 20,500,000 | $ 75,000,000.0 | $ 21,500,000
Impairment charge |  |  |  | $ 186,900,000 |  |  |  |
Property, Plant and Equipment [Member] | Mobidiag |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment charge |  |  | 12,100,000 |  |  |  |  |
Property, Plant and Equipment [Member] | ultrasound imaging assets |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Impairment charge |  |  | $ 5,800,000 |  |  |  |  |
Equipment and Software [Member] | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 3 years |  |  | 3 years |  |
Equipment and Software [Member] | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 10 years |  |  | 10 years |  |
Equipment Under Customer Usage Agreements [Member] | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 3 years |  |  | 3 years |  |
Equipment Under Customer Usage Agreements [Member] | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 8 years |  |  | 8 years |  |
Building and Improvements [Member] | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 20 years |  |  | 20 years |  |
Building and Improvements [Member] | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 35 years |  |  | 35 years |  |
Furniture and Fixtures [Member] | Minimum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 5 years |  |  | 5 years |  |
Furniture and Fixtures [Member] | Maximum |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 7 years |  |  | 7 years |  |

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