SPECIAL CHARGES (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended			12 Months Ended	3 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2012 Fiscal 2012 Action [Member] employee	Jun. 30, 2012 Fiscal 2012 Action [Member]	Mar. 31, 2012 Fiscal 2012 Action [Member] employee	Sep. 30, 2012 Fiscal 2012 Action [Member]	Jun. 30, 2011 Fiscal Year 2010 [Member]	Mar. 31, 2011 Fiscal Year 2010 [Member]	Sep. 30, 2010 Fiscal Year 2010 [Member] aircraft employee	Mar. 31, 2010 Fiscal Year 2010 [Member] employee
Restructuring Cost and Reserve [Line Items]
Number of positions planned to be eliminated				100		200				100	160
Special Charges	$ 18.2	$ 1.4	$ 13.2	$ 1.0	$ 4.8		$ 9.3	$ (1.2)	$ 2.6	$ 4.3	$ 5.0
Number of aircrafts to be disposed of										2
Loss on impairment of intangible assets						8.0
Impairment of certain tangible assets				4.7		3.2
Impairment of aircrafts										$ 3.9