SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - AVAILABLE FOR SALE SECURITIES (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		12 Months Ended
	Mar. 31, 2014		Sep. 30, 2013
Accounting Policies [Abstract]
Available-for-sale securities, fair value disclosure	$ 11.2	[1]	$ 11.7
Available-for-sale securities, gross unrealized gain (loss)	8.6		9.1
Accumulated other comprehensive income, available-for-sale securities adjustment, net of tax	$ 5.1		$ 5.4

[1] Included in Other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets