Stockholders' Equity and Noncontrolling Interests - Repurchase table (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Accelerated Share Repurchases [Line Items]
Number (in shares)	5.7	4.8	7.8
Average repurchase price ($ per share)	$ 81.61	$ 87.47	$ 80.52
Total cost	$ 461.3	$ 422.0	$ 624.0
Accelerated Share Repurchase Program
Accelerated Share Repurchases [Line Items]
Number (in shares)	1.0	2.3	0.0
Average repurchase price ($ per share)	$ 83.98	$ 90.00	$ 0.00
Total cost	$ 85.8	$ 203.9	$ 0.0