Stockholders' Equity (Activity for Stock Option Awards) (Details) shares in Thousands	3 Months Ended
	Dec. 31, 2016 $ / shares shares
Stock-Based Compensation
Number of options, beginning balance	4,944
Weighted Average Exercise Price Per Share, beginning balance | $ / shares	$ 35.35
Options granted, Number of options	0
Options exercised, Number of options	(139)
Options exercised, Weighted Average Exercise Price Per Share | $ / shares	$ 34.83
Options forfeited, Number of options	(13)
Options forfeited, Weighted Average Exercise Price Per Share | $ / shares	$ 42.19
Number of options, ending balance	4,792
Weighted Average Exercise Price Per Share, ending balance | $ / shares	$ 35.35