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v3.21.2

Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipments (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 26, 2020 | Sep. 26, 2020 | Sep. 25, 2021 | Sep. 28, 2019
Property, Plant and Equipment [Line Items] |  |  |  |
Manufacturing Equipment And Software |  | $ 460.7 | $ 467.1 |
Equipment Under Customer Usage Agreements |  | 456.8 | 484.6 |
Buildings and Improvements, Gross |  | 167.3 | 191.2 |
Leasehold Improvements, Gross |  | 44.3 | 49.7 |
Land |  | 40.7 | 41.3 |
Furniture and Fixtures, Gross |  | 16.1 | 16.8 |
Finance Lease, Right-of-Use Asset |  | 0.0 |  |
Property, Plant and Equipment, Gross |  | 1,185.9 | 1,260.6 |
Less - accumulated depreciation and amortization |  | (694.4) | (695.9) |
Property, plant and equipment, net |  | 491.5 | 564.7 | $ 470.9
Grants received from Department of defense | $ 119.3 | $ 7.6 |  |
Department of defense funds received |  |  | 21.2 |
Property, Plant and Equipment [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Finance Lease, Right-of-Use Asset |  |  | $ 9.9 |
Equipment and Software [Member] | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 3 years |
Equipment and Software [Member] | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 10 years |
Equipment Under Customer Usage Agreements [Member] | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 3 years |
Equipment Under Customer Usage Agreements [Member] | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 8 years |
Building and Improvements [Member] | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 20 years |
Building and Improvements [Member] | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 35 years |
Furniture and Fixtures [Member] | Minimum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 5 years |
Furniture and Fixtures [Member] | Maximum |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Property, plant and equipment, estimated useful life |  |  | 7 years |

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