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Other Balance Sheet Information - Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Mar. 30, 2019
Sep. 29, 2018
Balance Sheet Related Disclosures [Abstract]    
Equipment $ 386.8 $ 380.3
Equipment under customer usage agreements 422.9 399.6
Building and improvements 189.4 188.3
Leasehold improvements 64.3 63.0
Land 46.3 46.3
Furniture and fixtures 17.5 16.8
Property, plant and equipment, gross 1,127.2 1,094.3
Less – accumulated depreciation and amortization (657.5) (616.1)
Property, plant and equipment, net $ 469.7 $ 478.2