Presentation of Financial Information - Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Apr. 03, 2016	Mar. 29, 2015	Apr. 03, 2016	Mar. 29, 2015
BASIC
Net income (loss)	$ (212.0)	$ 24.9	$ (188.3)	$ 44.6
Weighted-average common shares outstanding (in shares)	109,600	94,000	102,000	94,000
Basic earnings (loss) per share (USD per share)	$ (1.93)	$ 0.26	$ (1.85)	$ 0.47
DILUTED
Net income (loss)	$ (212.0)	$ 24.9	$ (188.3)	$ 44.6
Weighted-average common shares outstanding (in shares)	109,600	94,000	102,000	94,000
Dilutive effect of stock awards	0	1,300	0	1,200
Weighted-average common shares outstanding on a diluted basis (in shares)	109,600	95,300	102,000	95,200
Diluted earnings per share (USD per share)	$ (1.93)	$ 0.26	$ (1.85)	$ 0.47