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Gross amount at the balance sheet date of long-lived, depreciable asset that are equipment placed at customer locations for which title is not transferred to the Company's customers.

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Grants received from Department of defense

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Gross amount as of the balance sheet date of long-lived, depreciable assets that include manufacturing and other equipment with finite lives used to produce goods and services, and computer equipment and software.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount, after accumulated amortization, of right-of-use asset from finance lease.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Amount before accumulated depreciation of additions or improvements to assets held under a lease arrangement.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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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