Stock-Based Compensation (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	9 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Stock-Based Compensation
Options outstanding, Number of options	4,471	4,535	4,556
Options outstanding, Weighted-Average Exercise Price	$ 25.01	$ 24.90	$ 21.79
Options outstanding, Weighted-Average Remaining Life in Years	5 years 10 months 25 days
Options outstanding, Aggregate Intrinsic Value	$ 67,103
Options vested and exercisable, Number of options	2,730
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 21.84
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 4 months 27 days
Options vested and exercisable, Aggregate Intrinsic Value	49,592
Options vested and expected to vest, Number of options	4,368
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 24.87
Options vested and to expected vest, Weighted-Average Remaining Life in Years	5 years 9 months 20 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 66,167