Earnings (Loss) per Share (Details) shares in Millions	12 Months Ended
	Sep. 30, 2016 shares	Sep. 25, 2015 shares	Sep. 26, 2014 shares	Jun. 28, 2013
Earnings (Loss) per Share [Abstract]
Distribution ratio	0.125			0.125
Weighted-average shares for basic earnings (loss) per share (in shares)	110.6	115.8	64.9
Weighted Average Number of Shares Outstanding, Diluted	0.9	1.4	0.0
Weighted-average shares for diluted earnings (loss) per share (in shares)	111.5	117.2	64.9
Antidilutive securities excluded from weighted-average shares (in shares)	1.7	0.1	5.7