Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, beginning balance	1,812
Options granted, Number of options	537
Options vested, Number of options	(930)
Options forfeited, Number of options	(26)
Number of Options, ending balance	1,393	1,812
Weighted-Average Grant Date Fair Value Per Share, beginning balance	$ 30.03
Options granted, Weighted-Average Grant Date Fair Value Per Share	34.19	$ 41.78	$ 28.22
Options vested, Weighted-Average Grant Date Fair Value Per Share	26.24
Options forfeited, Weighted-Average Grant Date Fair Value Per Share	33.66
Weighted-Average Grant Date Fair Value Per Share, ending balance	$ 33.96	$ 30.03