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Stock Compensation Plan (Schedule Of Share Based Compensation Option And SARs Award Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Jul. 31, 2014
Jul. 31, 2013
Jul. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Awards, outstanding beginning balance (in shares) 2,753 3,170 2,661
Awards, granted (in shares) 352 412 651
Awards, exercised (in shares) (321) (735) (74)
Awards, forfeited or expired (in shares) (28) (94) (68)
Awards, outstanding ending balance (in shares) 2,756 2,753 3,170
Awards, exercisable ending balance (in shares) 1,973    
Weighted-average exercise price, outstanding beginning balance (in dollars per share) $ 37.63 $ 34.20 $ 32.02
Weighted-average exercise price, granted (in dollars per share) $ 73.13 $ 57.43 $ 41.94
Weighted-average exercise price, exercised (in dollars per share) $ 37.62 $ 33.22 $ 27.10
Weighted-average exercise price, forfeited or expired (in dollars per share) $ 48.87 $ 43.21 $ 30.77
Weighted-average exercise price, outstanding ending balance (in dollars per share) $ 42.06 $ 37.63 $ 34.20
Weighted-average exercise price, exercisable ending balance (in dollars per share) $ 34.45    
Weighted-average remaining contractual term, outstanding ending balance (in years) 5 years 9 months 18 days    
Weighted-average remaining contractual term, exercisable ending balance (in years) 4 years 9 months 5 days    
Aggregate intrinsic value, outstanding ending balance $ 93,034    
Aggregate intrinsic value, exercisable ending balance $ 80,987