Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - Stock Options [Member] - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2024	Mar. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Beginning balance	858	1,393
Granted, Number of options	81	87
Vested, Number of options	(9)	(549)
Forfeited, Number of options	(4)	(5)
Number of Options, Ending balance	926	926
Weighted-Average Grant Date Fair Value Per Share, Beginning balance	$ 35.37	$ 33.96
Granted, Weighted-Average Grant Date Fair Value Per Share	58.15	58.34
Vested, Weighted Average Exercise Price Per Share	31.78	32.01
Forfeited, Weighted-Average Grant Date Fair Value Per Share	35.54	35.24
Weighted-Average Grant Date Fair Value Per Share, Ending balance	$ 37.4	$ 37.4