Stock-Based Compensation (Stock Options Vested, Or Expected to Vest and Are Exercisable) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	6 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013
Stock-Based Compensation
Options outstanding, Number of options	4,722	4,947	4,423
Options outstanding, Weighted-Average Exercise Price	$ 27.74	$ 27.23	$ 25.06
Options outstanding, Weighted-Average Remaining Life in Years	5 years 10 months 24 days
Options outstanding, Aggregate Intrinsic Value	$ 65,132
Options vested and exercisable, Number of options	3,014
Options vested and exercisable, Weighted-Average Exercise Price Per Share	$ 23.75
Options vested and exercisable, Weighted-Average Remaining Life in Years	4 years 6 months
Options vested and exercisable, Aggregate Intrinsic Value	53,614
Options vested and expected to vest, Number of options	4,596
Options vested and expected to vest, Weighted-Average Exercise Price Per Share	$ 27.51
Options vested and to expected vest, Weighted-Average Remaining Life in Years	5 years 10 months 24 days
Options vested and expected to vest, Aggregate Intrinsic Value	$ 64,465