Stockholders' Equity (Changes in Nonvested Stock Options) (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Number of Options, beginning balance	1,679
Weighted-Average Exercise Price Per Share, beginning balance	$ 34.83
Options granted, Number of options	751
Options granted, Weighted-Average Exercise Price Per Share	$ 46.55
Options vested, Number of options	(664)
Options vested, Weighted-Average Exercise Price Per Share	$ 33.07
Options forfeited, Number of options	(42)
Options forfeited, Weighted-Average Exercise Price Per Share	$ 38.24
Number of Options, ending balance	1,724	1,679
Weighted-Average Exercise Price Per Share, ending balance	$ 40.54	$ 34.83
Stock Options [Member]
Options granted, Weighted-Average Exercise Price Per Share	$ 17.02	$ 15.63	$ 15.84