SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, SALES TAX ACCOUNTING (Details) - USD ($) $ in Millions		12 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accounting Policies [Abstract]
Sales tax		$ 31.0	$ 44.1	$ 47.4
TEFA	[1]	0.0	0.0	1.4
Total		$ 31.0	$ 44.1	$ 48.8

[1] TEFA was phased out in January 2014.