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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. 01, 2017
Oct. 02, 2016
Sep. 27, 2015
Sep. 28, 2014
Stock Options        
Outstanding Beginning Balance 0.5 0.7 2.7  
Assumed from acquisition     0.2  
Exercised (0.2) (0.2) (2.1)  
Forfeited 0.0 0.0 (0.1)  
Outstanding Ending Balance 0.3 0.5 0.7 2.7
Exercisable stock options 0.3      
Exercisable and expected to vest stock options 0.3      
Weighted average Exercise Price        
Outstanding Beginning Balance $ 18.75 $ 19.60 $ 22.70  
Assumed from acquisition     24.18  
Exercised 18.98 21.16 23.83  
Forfeited 21.63 21.44 23.90  
Outstanding Ending Balance 18.59 $ 18.75 $ 19.60 $ 22.70
Exercisable stock options, Weighted Average Exercise Price 18.38      
Exercisable and expected to vest stock options, Weighted Average Exercise Price $ 18.59      
Intrinsic Value        
Outstanding, Intrinsic Value $ 10.2 $ 10.7 $ 9.1 $ 7.4
Exercised, Intrinsic Value $ 15.8  
Exercisable stock options, Intrinsic Value 10.0      
Exercisable and expected to vest stock options, Intrinsic Value $ 10.2      
Weighted Average Remaining Life        
Outstanding, Weighted Average Remaining Life 2 years 9 months 10 days 3 years 6 months 4 years 2 years
Exercisable stock options, Weighted Average Remaining Life 2 years 8 months 1 day      
Exercisable and expected to vest stock options, Weighted Average Remaining Life 2 years 9 months 10 days