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Summary of Significant Accounting Policies - Estimated Useful Lives of Property, Plant and Equipments (Detail) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 26, 2015
Property, Plant and Equipment [Line Items]      
Manufacturing Equipment And Software $ 422.4 $ 381.9  
Equipment Under Customer Usage Agreements 368.7 334.6  
Buildings and Improvements, Gross 172.0 186.1  
Leasehold Improvements, Gross 60.6 65.6  
Land 46.3 51.9  
Furniture and Fixtures, Gross 20.8 18.4  
Property, Plant and Equipment, Gross 1,090.8 1,038.5  
Less - accumulated depreciation and amortization (599.6) (578.3)  
Property, plant and equipment, net $ 491.2 $ 460.2 $ 457.1
Building and Improvements [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 20 years    
Building and Improvements [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 35 years    
Equipment and Software [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 3 years    
Equipment and Software [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 10 years    
Equipment Under Customer Usage Agreements [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 3 years    
Equipment Under Customer Usage Agreements [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 8 years    
Furniture and Fixtures [Member] | Minimum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 5 years    
Furniture and Fixtures [Member] | Maximum      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, estimated useful life 7 years