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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 26, 2015
Mar. 29, 2014
Dec. 28, 2013
Sep. 24, 2016
Sep. 26, 2015
Sep. 27, 2014
Aug. 01, 2012
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Investments, Fair Value Disclosure $ 27.7     $ 2.6 $ 27.7    
Impairment charge   $ 28.6          
Impairment charge allocated to intangible assets   27.1          
Non-cash impairment charges       0.0 0.0 $ 38.4  
Asset impairment charge     $ 3.1        
Cost-method equity investments in non-publicly traded securities 4.2     3.5 4.2    
Other-than-temporary impairment charges           $ 6.9  
Borrowed principal under credit agreement       1,000.0      
Property, Plant and Equipment [Member]              
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Non-cash impairment charges   $ 1.5          
Credit Agreement [Member]              
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Borrowed principal under credit agreement       1,410.0     $ 2,500.0
Accounts Receivable Securitization [Member]              
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Borrowed principal under credit agreement       200.0      
Senior Notes [Member]              
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Fair value of debt instrument 1,030.0     1,060.0 1,030.0    
Fair Value, Inputs, Level 3 [Member]              
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Investments, Fair Value Disclosure 0.0     $ 0.0 $ 0.0    
Diagnostics [Member] | Fair Value, Inputs, Level 3 [Member]              
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]              
Non-cash impairment charges $ 5.1