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Other Balance Sheet Information - Other Balance Sheet Information of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Apr. 01, 2017
Sep. 24, 2016
Balance Sheet Related Disclosures [Abstract]    
Equipment and software $ 397.1 $ 381.9
Equipment under customer usage agreements 346.6 334.6
Building and improvements 169.4 186.1
Leasehold improvements 71.9 65.6
Land 46.2 51.9
Furniture and fixtures 18.5 18.4
Property, plant and equipment, gross 1,049.7 1,038.5
Less – accumulated depreciation and amortization (567.0) (578.3)
Property, plant and equipment, net $ 482.7 $ 460.2