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STOCK-BASED COMPENSATION - Compensation Costs Recognized (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Total equity compensation cost $ 6.7 $ 6.7 $ 5.8
Compensation cost capitalized (2.2) (1.8) (1.8)
Compensation cost recognized in net income 4.5 4.9 4.0
Income tax benefit recognized in net income (1.7) (1.9) (1.5)
Compensation cost recognized in net income, net of income tax $ 2.8 $ 3.0 $ 2.5