Stock-Based Compensation (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 31, 2011 years	Sep. 30, 2011
Stock-Based Compensation
Options outstanding, Number of options	4,858	4,228
Options outstanding, Weighted-Average Exercise Price	$ 21.34	$ 20.12
Options outstanding, Weighted-Average Remaining Life in Years	6.1
Options outstanding, Aggregate Intrinsic Value	$ 95,155
Options vested and exercisable, Number of options	3,145
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 18.37
Options vested and exercisable, Weighted-Average Remaining Life in Years	4.6
Options vested and exercisable, Aggregate Intrinsic Value	70,954
Options vested and expected to vest, Number of options	4,668
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 21.11
Options vested and to expected vest, Weighted-Average Remaining Life in Years	6.0
Options vested and expected to vest, Aggregate Intrinsic Value	$ 92,516