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Stock-Based Compensation - Summary of Stock Option Activity and Stock Appreciation Rights (Detail) - Employee Stock Option And Stock Appreciation Rights - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 27, 2015
Sep. 28, 2014
Sep. 29, 2013
Sep. 30, 2012
Stock Options        
Outstanding Beginning Balance 2.7 4.7 7.0  
Assumed from acquisition 0.2 0.6    
Exercised (2.1) (1.2) (1.9)  
Forfeited (0.1) (1.4) (0.4)  
Outstanding Ending Balance 0.7 2.7 4.7 7.0
Exercisable stock options 0.6      
Exercisable and expected to vest stock options 0.7      
Weighted average Exercise Price        
Outstanding Beginning Balance $ 22.70 $ 22.49 $ 20.26  
Assumed from acquisition 24.18 20.08    
Exercised 23.83 16.39 14.16  
Forfeited 23.90 26.55 24.33  
Outstanding Ending Balance 19.60 $ 22.70 $ 22.49 $ 20.26
Exercisable stock options, Weighted Average Exercise Price 19.13      
Exercisable and expected to vest stock options, Weighted Average Exercise Price $ 19.60      
Intrinsic Value        
Outstanding, Intrinsic Value $ 9.1 $ 7.4 $ 14.7 $ 21.6
Exercised, Intrinsic Value 15.8 $ 17.0 $ 17.0  
Exercisable stock options, Intrinsic Value 7.5      
Exercisable and expected to vest stock options, Intrinsic Value $ 9.1      
Weighted Average Remaining Life        
Outstanding, Weighted Average Remaining Life 4 years 2 years 1 year 7 months 31 days 2 years 6 months
Exercisable stock options, Weighted Average Remaining Life 3 years 6 months 30 days      
Exercisable and expected to vest stock options, Weighted Average Remaining Life 4 years