Share-Based Compensation (Details 3) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2011 Installment Year Contract
Summary of stock options outstanding
Stock Options, Beginning Balance	6,433,148
Stock Options, Grants	0
Stock Options, Exercised	(2,927,278)
Stock Options, Forfeited, canceled or expired	(48,519)
Stock Options, Ending Balance	3,457,351
Weighted Average Exercise Price, Beginning Period	$ 38.12
Weighted Average Exercise Price, Granted	$ 0.00
Weighted Average Exercise Price, Exercised	$ 35.28
Weighted Average Exercise Price, Forfeited, canceled or expired	$ 32.22
Weighted Average Exercise Price, Ending Period	$ 40.61
Stock options, Weighted Average Remaining Contractual Term (Years), Balance at ending balance	2.04
Stock Options, Aggregate Intrinsic Value, Balance at ending balance	$ 113,078
Stock Options, Vested and expected to vest at ending balance	3,457,351
Stock Options Exercisable at ending balance	3,457,351
Stock Options, Weighted Average Exercise Price, Vested and expected to vest ending balance	$ 40.61
Stock Options, Weighted Average Exercise Price, Exercisable at ending balance	$ 40.61
Stock Options, Weighted Average Remaining Contractual Term (Years), Vested and expected to vest at ending balance	2.04
Stock Options, Weighted Average Remaining Contractual Term (Years), Exercisable at ending balance	2.04
Stock Options Aggregate Intrinsic Value, Vested and expected to vest at ending balance	113,078
Stock Options Aggregate Intrinsic Value, Exercisable at ending balance	$ 113,078