COMMON STOCK (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			12 Months Ended							12 Months Ended
	May 31, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2011 Stock Options [Member]	Sep. 30, 2010 Stock Options [Member]	Sep. 30, 2012 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2011 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2010 Restricted Stock Units (RSUs) [Member]	Sep. 30, 2012 Performance Shares [Member]	Sep. 30, 2012 Common Stock [Member]	Sep. 30, 2011 Common Stock [Member]	Sep. 30, 2010 Common Stock [Member]
Share Repurchases
Shares repurchased											1,500,000	3,000,000	1,000,000
Value of shares repurchased											$ 42.4	$ 110.0	$ 34.5
Number of shares by which repurchase authorization expanded	3,000,000
Cumulative treasury stock repurchased		28,200,000
Shares remaining for purchase under the Board's authorization		500,000
Stock-Based Compensation
Number of shares authorized		15,300,000
Shares available for future grants		5,500,000
Treasury stock, shares		19,526,989	18,637,540
Vesting period, minimum				3 years			1 year
Vesting period, maximum				4 years			5 years
Maximum contractual term				10 years
Total intrinsic value of options exercised				1.3	23.3	3.9
Unrecognized compensation expense				9.4			5.3			6.1
Unrecognized compensation expense, weighted-average recognition period				2.3			2
Total vest date fair value of shares that vested							$ 6.8	$ 15.9	$ 7.3