Stock-Based Compensation (Schedule Of Restricted Stock And Restricted Stock Unit Activity) (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Sep. 30, 2011
Restricted Stock [Member]
Beginning Balance of outstanding restricted stock, Shares		90,000
Granted, Shares	57,000
Vested, Shares	(63,000)
Ending Balance of outstanding restricted stock, Shares	84,000	90,000
Weighted Average Grant Date Fair Value, Beginning Balance of outstanding restricted stock		$ 21.30
Weighted Average Grant Date Fair Value, Granted	$ 25.27
Weighted Average Grant Date Fair Value, Vested	$ 21.13
Weighted Average Grant Date Fair Value, Ending Balance of outstanding restricted stock	$ 24.11	$ 21.30
Restricted Stock Units [Member]
Beginning Balance of outstanding restricted stock, Shares		5,490,000
Granted, Shares	1,926,000
Vested, Shares	(2,538,000)
Forfeited or not earned, Shares	(293,000)
Ending Balance of outstanding restricted stock, Shares	4,585,000	5,490,000
Weighted Average Grant Date Fair Value, Beginning Balance of outstanding restricted stock		$ 17.75
Weighted Average Grant Date Fair Value, Granted	$ 19.82
Weighted Average Grant Date Fair Value, Vested	$ 15.59
Weighted Average Grant Date Fair Value, Forfeited or not earned	$ 18.56
Weighted Average Grant Date Fair Value, Ending Balance of outstanding restricted stock	$ 19.77	$ 17.75