Presentation of Financial Information - Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	200	100		300
BASIC
Net income (loss)	$ 115.2	$ 14.7	$ (73.1)	$ 59.2
Weighted-average common shares outstanding (in shares)	112,100	94,500	105,300	94,100
Basic earnings (loss) per share (USD per share)	$ 1.03	$ 0.16	$ (0.69)	$ 0.63
DILUTED
Net income (loss)	$ 115.2	$ 14.7	$ (73.1)	$ 59.2
Weighted-average common shares outstanding (in shares)	112,100	94,500	105,300	94,100
Dilutive effect of stock awards	2,500	1,900	0	1,500
Weighted-average common shares outstanding on a diluted basis (in shares)	114,600	96,400	105,300	95,600
Diluted earnings per share (USD per share)	$ 1.00	$ 0.15	$ (0.69)	$ 0.62