Stockholders' Equity (Activity for Stock Option Awards) (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2015 $ / shares shares
Stock-Based Compensation
Number of options, beginning balance	4,501
Weighted Average Exercise Price Per Share, beginning balance | $ / shares	$ 28.08
Options granted, Number of options	751
Options granted, Weighted Average Exercise Price Per Share | $ / shares	$ 46.55
Options exercised, Number of options	(568)
Options exercised, Weighted Average Exercise Price Per Share | $ / shares	$ 17.48
Options forfeited, Number of options	(43)
Options forfeited, Weighted Average Exercise Price Per Share | $ / shares	$ 38.24
Number of options, ending balance	4,641
Weighted Average Exercise Price Per Share, ending balance | $ / shares	$ 32.28