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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. 30, 2017 | Sep. 24, 2016 | Sep. 26, 2015
Property, Plant and Equipment [Line Items] |  |  |
Manufacturing Equipment And Software | $ 422.4 | $ 381.9 |
Equipment Under Customer Usage Agreements | 368.7 | 334.6 |
Buildings and Improvements, Gross | 172.0 | 186.1 |
Leasehold Improvements, Gross | 60.6 | 65.6 |
Land | 46.3 | 51.9 |
Furniture and Fixtures, Gross | 20.8 | 18.4 |
Property, Plant and Equipment, Gross | 1,090.8 | 1,038.5 |
Less - accumulated depreciation and amortization | (599.6) | (578.3) |
Property, plant and equipment, net | $ 491.2 | $ 460.2 | $ 457.1
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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- Definition 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. + References No definition available. + Details
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- Definition 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 -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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