Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 25, 2016	Sep. 26, 2015
Statement of Financial Position [Abstract]
Accounts receivable, reserves	$ 11.4	$ 11.1
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	1,623,000	1,623,000
Preferred stock, issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	750,000,000	750,000,000
Common stock, issued (in shares)	284,361,000	282,495,000
Treasury Stock, Shares	7,289,000	0