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Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipments (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 24, 2016
Property, Plant and Equipment [Line Items]
Manufacturing Equipment And Software	$ 391.9	$ 357.9
Equipment Under Customer Usage Agreements	399.6	368.7
Buildings and Improvements, Gross	175.1	172.0
Leasehold Improvements, Gross	63.0	60.6
Land	46.3	46.3
Furniture and Fixtures, Gross	18.4	20.8
Property, Plant and Equipment, Gross	1,094.3	1,026.3
Less - accumulated depreciation and amortization	(616.1)	(553.5)
Property, plant and equipment, net	$ 478.2	$ 472.8	$ 451.9
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
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
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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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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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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 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 depreciation of additions or improvements to assets held under a lease arrangement.

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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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