Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2022	Mar. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, beginning balance	1,844	2,063
Options granted, Number of options	4	441
Options vested, Number of options	(65)	(713)
Options forfeited, Number of options	(16)	(24)
Number of Options, ending balance	1,767	1,767
Weighted-Average Grant Date Fair Value Per Share, beginning balance	$ 29.39	$ 25.77
Options granted, Weighted-Average Grant Date Fair Value Per Share	40.62	42.18
Options vested, Weighted-Average Grant Date Fair Value Per Share	23.19	26.23
Options forfeited, Weighted-Average Grant Date Fair Value Per Share	29.79	29.20
Weighted-Average Grant Date Fair Value Per Share, ending balance	$ 29.64	$ 29.64