Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	12 Months Ended
	Dec. 30, 2016	Sep. 30, 2016	Sep. 25, 2015	Mar. 16, 2016	Nov. 19, 2015	Jan. 23, 2015
January 2015 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount						$ 300.0
Stock Repurchased During Period, Shares	0	3,199,279	823,592
Stock Repurchased During Period, Value	$ 0.0	$ 225.0	$ 75.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 0.0
November 2015 Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount					$ 500.0
Stock Repurchased During Period, Shares	1,063,337	6,510,824	0
Stock Repurchased During Period, Value	$ 74.4	$ 425.6	$ 0.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 0.0
March 2016 Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 350.0
Stock Repurchased During Period, Shares	1,501,676	0	0
Stock Repurchased During Period, Value	$ 84.0	$ 0.0	$ 0.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 266.0