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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
Oct. 02, 2016
Sep. 27, 2015
Sep. 28, 2014
Sep. 30, 2012
Sep. 29, 2013
Stock Options          
Outstanding Beginning Balance 0.7 2.7 4.7    
Assumed from acquisition   0.2 0.6    
Exercised (0.2) (2.1) (1.2)    
Forfeited 0.0 (0.1) (1.4)    
Outstanding Ending Balance 0.5 0.7 2.7    
Exercisable stock options 0.4        
Exercisable and expected to vest stock options 0.5        
Weighted average Exercise Price          
Outstanding Beginning Balance $ 19.60 $ 22.70 $ 22.49    
Assumed from acquisition   24.18 20.08    
Exercised 21.16 23.83 16.39    
Forfeited 21.44 23.90 26.55    
Outstanding Ending Balance 18.75 $ 19.60 $ 22.70    
Exercisable stock options, Weighted Average Exercise Price 18.24        
Exercisable and expected to vest stock options, Weighted Average Exercise Price $ 18.75        
Intrinsic Value          
Outstanding, Intrinsic Value $ 10.7 $ 9.1 $ 7.4   $ 14.7
Exercised, Intrinsic Value $ 15.8 $ 17.0    
Exercisable stock options, Intrinsic Value 9.8        
Exercisable and expected to vest stock options, Intrinsic Value $ 10.7        
Weighted Average Remaining Life          
Outstanding, Weighted Average Remaining Life 3 years 6 months 4 years 2 years 1 year 8 months  
Exercisable stock options, Weighted Average Remaining Life 3 years 3 months        
Exercisable and expected to vest stock options, Weighted Average Remaining Life 3 years 6 months