FAIR VALUE MEASUREMENTS (Reconciliation of Level 3 Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
AOCL
Balance at October 1, 2011	$ (0.9)	$ (0.7)
Change in fair value	(0.7)	0.2	(0.2)
Sales or redemptions	0.1		(0.1)
Balance at September 30, 2012	(0.4)	(0.9)	(0.7)
Auction Rate Securities [Member]
Available-For-Sale
Balance at October 1, 2011	11.1
Change in fair value
Sales or redemptions	(3.8)
Balance at September 30, 2012	7.3
AOCL
Balance at October 1, 2011	1.3
Change in fair value
Sales or redemptions	(0.8)
Balance at September 30, 2012	0.5
(Gain)/Loss	$ 0.1