Consolidated Statements of Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 28, 2014	Oct. 01, 2017	Oct. 02, 2016
Statement of Stockholders' Equity [Abstract]
Tax benefit from exercise of stock options/vesting of RSUs	$ 131.3	$ 0.0	$ 124.3
Tax benefit from sale of common stock	$ 0.2	$ 0.0	$ 0.2
Cash dividends declared per share	$ 0.680	$ 0.000	$ 0.850