Stock-Based Compensation (Weighted Average Assumptions for Recognized Fair Value of Stock-Based Employee Compensation Cost) (Details)	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Risk-free interest rate, min (as a percent)	3.80%	1.20%	0.50%
Risk-free interest rate, max (as a percent)	4.20%	1.80%	1.30%
Expected volatility, min (as a percent)	26.80%	26.00%	25.40%
Expected volatility, max (as a percent)	27.50%	27.00%	26.60%
Expected dividend yield	1.60%	1.60%	1.60%
Director grants
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (in years)	8 years	8 years	8 years
Officer grants
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (in years)	7 years	7 years	8 years
Non-officer grants
Share-based Compensation Arrangement by Share-based Payment Award
Expected life (in years)	7 years	7 years	7 years