Presentation of Financial Information - Earning Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
Jan. 01, 2017	Jan. 03, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.3	0.6
BASIC
Net income	$ 19.5	$ 23.7
Weighted-average common shares outstanding (in shares)	114.0	95.1
Basic earnings (loss) per share (USD per share)	$ 0.17	$ 0.25
DILUTED
Net income	$ 19.5	$ 23.7
Weighted-average common shares outstanding (in shares)	114.0	95.1
Dilutive effect of stock awards	2.3	1.4
Weighted-average common shares outstanding on a diluted basis (in shares)	116.3	96.5
Diluted earnings per share (USD per share)	$ 0.17	$ 0.25

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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