Stockholders' Equity (Summary of Activity for Stock Option Awards) (Details) - Stock Options [Member] - $ / shares shares in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2025	Mar. 31, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options, Beginning balance	3,220	3,578
Granted, Number of options	38	41
Exercised, Number of options	(298)	(659)
Forfeited, Number of options	(4)	(4)
Number of options, Ending balance	2,956	2,956
Weighted Average Exercise Price Per Share, Beginning balance	$ 86.54	$ 86.03
Granted, Weighted Average Exercise Price Per Share	193.09	191.45
Exercised, Weighted Average Exercise Price Per Share	73.59	78.24
Forfeited, Weighted Average Exercise Price Per Share	108.31	108.31
Weighted Average Exercise Price Per Share, Ending balance	$ 89.2	$ 89.2