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Stockholder's Investments Stockholder's Investment - Schedule of Stock Option Valuation Assumptions (Details) - $ / shares
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 1 month 10 days 6 years 1 month 10 days 6 years 18 days
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 29.55% 29.95% 34.01%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 2.70% 2.59% 2.48%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.30% 1.60% 1.90%
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Market Value Of Underlying Stock at Grant Date $ 35.14 $ 20.02 $ 22.76
Black-Scholes Option Valuation Assumptions, Weighted-Average Exercise Price 35.14 20.02 22.76
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 7.56 $ 4.58 $ 6.12