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Stock Compensation Plan (Schedule of Share Based Compensation SARs Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2,290 2,381 2,385 2,756
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 318 441    
Awards, granted (in shares) 143      
Awards, vested (in shares) (247)      
Awards, forfeited (in shares) (19)      
Weighted-average grant-date fair value, outstanding beginning balance (in dollars per share) $ 30.39      
Weighted-average grant-date fair value, granted (in dollars per share) 50.78      
Weighted-average grant-date fair value, vested (in dollars per share) 29.36      
Weighted-average grant-date fair value, forfeited (in dollars per share) 36.65      
Weighted-average grant-date fair value, outstanding ending balance (in dollars per share) $ 42.46