Stockholders' Equity (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Stock-Based Compensation
Options outstanding, Number of options	4,501	4,423
Options outstanding, Weighted-Average Exercise Price	$ 28.08	$ 25.06
Options outstanding, Weighted-Average Remaining Life in Years	5 years 7 months 6 days
Options outstanding, Aggregate Intrinsic Value	$ 87,923
Options vested and exercisable, Number of options	2,822
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 24.07
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 1 month 6 days
Options vested and exercisable, Aggregate Intrinsic Value	66,458
Options vested and expected to vest, Number of options	4,419
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 27.92
Options vested and to expected vest, Weighted-Average Remaining Life in Years	5 years 6 months
Options vested and expected to vest, Aggregate Intrinsic Value	$ 87,066