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Stock Compensation Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Shares issued for stock based compensation (in shares) 4,400,000          
Stock based compensation award life 10 years          
Stock based compensation award vesting period 3 years          
Stock based compensation, shares available for grant (in shares) 4,100,000          
Total unrecognized compensation expense $ 20.2          
Cash received from exercise of stock option 0.0 $ 0.0 $ 1.1      
Tax benefit from exercise of stock options $ 15.5 $ 10.3 $ 18.1      
Stock Appreciation Rights (SARs) [Member]            
Weighted-average grant-date fair value (in dollars per share) $ 50.78 $ 35.20 $ 29.12      
Intrinsic value of options and SARs exercised $ 22.6 $ 13.1 $ 37.4      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares 247,000 302,000 420,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 19.6 $ 10.8 $ 13.6      
Restricted Stock Units (RSUs) [Member]            
Weighted-average grant-date fair value (in dollars per share) $ 154.19 $ 102.20 $ 83.50      
Stock based compensation, restricted shares granted (in shares) 91,000 142,000 143,000      
Stock based compensation, restricted shares vested (in shares) 121,000 134,000 113,000      
Stock based compensation, total fair value of restricted shares $ 19.3 $ 14.6 $ 9.9      
Expected to be Recognized in 2011 [Member] | Scenario, Forecast [Member]            
Total unrecognized compensation expense       $ 1.0 $ 6.6 $ 12.6
Maximum [Member]            
Stock based compensation, estimated forfeiture rates 22.20%          
Minimum [Member]            
Stock based compensation, estimated forfeiture rates 0.00%