Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Dec. 31, 2017	Jan. 01, 2017	Oct. 01, 2017
Equity [Abstract]
Authorized shares of common stock	2,400,000,000		2,400,000,000
Par value of common stock	$ 0.001		$ 0.001
Authorized shares of preferred stock	7,500,000
Outstanding shares of preferred stock			0
Shares of common stock repurchased	28,500,000	7,600,000
Total cost of common stock repurchased	$ 1,618.2	$ 413.7
Shares available for repurchase	51,800,000
Cash dividend declared to shareholders	$ 0.30
Dividends payable, payment date	Feb. 23, 2018
Dividends payable, record date	Feb. 08, 2018