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Stockholder's Investments Stockholder's Investment - Schedule of Stock Option Valuation Assumptions (Details) - $ / shares
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Share-based Payment Arrangement [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 2 months 12 days 6 years 2 months 12 days 6 years 25 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 26.07% 26.05% 28.19%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 2.63% 2.71% 2.72%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.64% 3.01% 1.96%
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Market Value Of Underlying Stock at Grant Date $ 54.05 $ 43.96 $ 36.85
Black-Scholes Option Valuation Assumptions, Weighted-Average Exercise Price 54.05 43.96 36.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 10.63 $ 9.70 $ 7.96