Stockholders' Equity (Changes in Non-vested Stock Options) (Details) - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2023	Mar. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value Per Share, Ending balance	$ 31.39	$ 31.39
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Beginning balance	1,751	1,812
Granted, Number of options	4	522
Exercised, Number of options | shares	(65)	(642)
Forfeited, Number of options	(15)	(17)
Number of Options, Ending balance	1,675	1,675
Weighted-Average Grant Date Fair Value Per Share, Beginning balance	$ 30.98	$ 30.03
Granted, Weighted-Average Grant Date Fair Value Per Share	40.23	33.67
Exercised, Weighted-Average Grant Date Fair Value Per Share	22.13	29.07
Forfeited, Weighted-Average Grant Date Fair Value Per Share	$ 32.89	$ 33.23