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Other Balance Sheet Information - Property, Plant and Equipment (Detail) - USD ($) $ in Millions | Mar. 27, 2021 | Sep. 26, 2020
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Balance Sheet Related Disclosures [Abstract] |  |
Equipment | $ 491.5 | $ 460.7
Equipment under customer usage agreements | 471.6 | 456.8
Building and improvements | 178.7 | 167.3
Leasehold improvements | 47.0 | 44.3
Land | 41.4 | 40.7
Furniture and fixtures | 16.8 | 16.1
Finance Lease, Right-of-Use Asset, after Accumulated Amortization | 8.4 | 0.0
Property, plant and equipment, gross | 1,255.4 | 1,185.9
Less – accumulated depreciation and amortization | (721.8) | (694.4)
Property, plant and equipment, net | $ 533.6 | $ 491.5

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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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