Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] shares in Thousands	3 Months Ended
	Dec. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, beginning balance | shares	2,068
Weighted-Average Grant Date Fair Value Per Share, beginning balance | $ / shares	$ 23.43
Options granted, Number of options | shares	626
Options granted, Weighted-Average Grant Date Fair Value Per Share | $ / shares	$ 28.55
Options vested, Number of options | shares	(768)
Options vested, Weighted-Average Grant Date Fair Value Per Share | $ / shares	$ 21.43
Options forfeited, Number of options | shares	(21)
Options forfeited, Weighted-Average Grant Date Fair Value Per Share | $ / shares	$ 25.19
Number of Options, ending balance | shares	1,905
Weighted-Average Grant Date Fair Value Per Share, ending balance | $ / shares	$ 25.90