Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2017	Sep. 24, 2016
Statement of Financial Position [Abstract]
Accounts receivable, reserves	$ 9.8	$ 12.7
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,623,000	1,623,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	287,853,000	285,015,000
Treasury stock, shares	12,560,000	7,289,000