Stockholders' Equity (Schedule of Assumptions Used in Estimate of Fair Value of Stock Option Awards) (Details) - Stock Options [Member] - $ / shares	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average exercise price per share	$ 84.84	$ 115.3	$ 82.46
Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (years)	6 years 7 months 6 days	6 years 7 months 6 days	6 years 6 months
Estimated volatility	34.70%	33.80%	33.30%
Estimated dividend yield	0.70%	0.60%	0.30%
Risk-free interest rate	3.40%	1.10%	0.40%
Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (years)	8 years 9 months 18 days	8 years 8 months 12 days	8 years 8 months 12 days
Estimated volatility	37.60%	36.40%	36.20%
Estimated dividend yield	0.90%	0.80%	0.60%
Risk-free interest rate	4.40%	3.50%	1.00%