Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] - $ / shares shares in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2021	Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, beginning balance	2,106	2,078
Options granted, Number of options		773
Options vested, Number of options		(742)
Options forfeited, Number of options	(19)	(22)
Number of Options, ending balance	2,087	2,087
Weighted-Average Grant Date Fair Value Per Share, beginning balance	$ 25.81	$ 24.69
Options granted, Weighted-Average Grant Date Fair Value Per Share		28.22
Options vested, Weighted-Average Grant Date Fair Value Per Share		25.19
Options forfeited, Weighted-Average Grant Date Fair Value Per Share	24.97	25.01
Weighted-Average Grant Date Fair Value Per Share, ending balance	$ 25.82	$ 25.82