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Other Balance Sheet Information - Other Balance Sheet Information of Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
Dec. 26, 2015
Sep. 26, 2015
Balance Sheet Related Disclosures [Abstract]    
Equipment and software $ 371.4 $ 365.9
Equipment under customer usage agreements 311.1 305.7
Building and improvements 182.5 182.1
Leasehold improvements 58.6 59.2
Land 51.4 51.4
Furniture and fixtures 17.1 17.3
Property, plant and equipment, gross 992.1 981.6
Less – accumulated depreciation and amortization (537.6) (524.5)
Property, plant and equipment, net $ 454.5 $ 457.1