EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
	Apr. 03, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Basic EPS:
Net Income		$ 21.7	$ 10.7	$ 174.9	$ 158.4
Less: Income allocated to participating securities		0.1	0.0	0.4	0.5
Net Income Available to Common Shareholders		$ 21.6	$ 10.7	$ 174.5	$ 157.9
Weighted Average Shares Outstanding, Basic (in Shares)		48,100	44,400	46,400	43,600
Basic Earnings Per Share of Common Stock (in dollars per share)		$ 0.45	$ 0.24	$ 3.76	$ 3.62
Diluted EPS:
Net Income		$ 21.7	$ 10.7	$ 174.9	$ 158.4
Less: Income allocated to participating securities		0.1	0.0	0.4	0.5
Net Income Available to Common Shareholders		$ 21.6	$ 10.7	$ 174.5	$ 157.9
Weighted Average Shares Outstanding, Basic (in Shares)		48,100	44,400	46,400	43,600
Dilutive Effect of Stock Options, Restricted Stock and Restricted Stock Units (in shares)		100	200	200	200
Weighted Average Diluted Shares (in shares)		48,200	44,600	46,600	43,800
Diluted Earnings Per Share of Common Stock (in dollars per share)		$ 0.45	$ 0.24	$ 3.75	$ 3.60
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common stock, issued (in shares)	2,500				2,875
Restricted stock and stock units subject to performance and/or market conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Outstanding shares excluded from calculation of diluted EPS (in shares)		400	500	400	500