Stockholders' Equity (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Stock-Based Compensation
Options outstanding, Number of options	4,641	4,501
Options outstanding, Weighted-Average Exercise Price	$ 32.28	$ 28.08
Options outstanding, Weighted-Average Remaining Life in Years	5 years 8 months 12 days
Options outstanding, Aggregate Intrinsic Value	$ 43,646
Options vested and exercisable, Number of options	2,917
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 27.40
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 3 months 18 days
Options vested and exercisable, Aggregate Intrinsic Value	$ 38,880
Options vested and expected to vest, Number of options	4,564
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 32.08
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	$ 43,595