Stock-Based Compensation (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Sep. 30, 2014
Stock-Based Compensation
Options outstanding, Number of options	4,784	5,111	4,501
Options outstanding, Weighted-Average Exercise Price	$ 31.76	$ 30.86	$ 28.08
Options outstanding, Weighted-Average Remaining Life in Years	5 years 9 months 18 days
Options outstanding, Aggregate Intrinsic Value	$ 111,163
Options vested and exercisable, Number of options	3,055
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 26.79
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 3 months 18 days
Options vested and exercisable, Aggregate Intrinsic Value	$ 86,162
Options vested and expected to vest, Number of options	4,682
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 31.50
Options vested and to expected vest, Weighted-Average Remaining Life in Years	5 years 8 months 12 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 109,961