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Stock Compensation Plan (Schedule of Share Based Compensation SARs Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 1,171 1,324 2,290 2,381
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 168 232    
Awards, granted (in shares) 80      
Awards, vested (in shares) (130)      
Awards, forfeited (in shares) (14)      
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) $ 56.72      
Weighted-average grant-date fair value, granted (in dollars per share) 98.19      
Weighted-average grant-date fair value, vested (in dollars per share) 51.76      
Weighted-average grant-date fair value, forfeited (in dollars per share) 75.85      
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) $ 80.75