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Other Balance Sheet Information - Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 26, 2020
Sep. 26, 2020
Balance Sheet Related Disclosures [Abstract]    
Equipment $ 483.1 $ 460.7
Equipment under customer usage agreements 478.3 456.8
Building and improvements 173.7 167.3
Leasehold improvements 45.2 44.3
Land 40.8 40.7
Furniture and fixtures 16.6 16.1
Property, plant and equipment, gross 1,237.7 1,185.9
Less – accumulated depreciation and amortization (723.2) (694.4)
Property, plant and equipment, net $ 514.5 $ 491.5