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, 2013	Sep. 30, 2012
Stock-Based Compensation
Options outstanding, Number of options	4,423	4,556
Options outstanding, Weighted-Average Exercise Price	$ 25.06	$ 21.79
Options outstanding, Weighted-Average Remaining Life in Years	5 years 8 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 69,796
Options vested and exercisable, Number of options	2,685
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 21.89
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 1 month 6 days
Options vested and exercisable, Aggregate Intrinsic Value	50,888
Options vested and expected to vest, Number of options	4,329
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 24.93
Options vested and to expected vest, Weighted-Average Remaining Life in Years	5 years 7 months 6 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 68,902