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Stock Option Plans (Stock Option Activity) (Details) (USD $)
12 Months Ended
Jul. 31, 2011
Jul. 31, 2010
Jul. 31, 2009
Jul. 31, 2008
Stock Option Plans        
Options Outstanding 4,193,997 4,771,812 4,998,125 5,181,778
Options Outstanding, Granted 551,601 643,974 366,588  
Net issuance upon exercise of stock options (1,121,751) (848,990) (505,363)  
Options Outstanding, Canceled (7,665) (21,297) (44,878)  
Weighted Average Exercise Price $ 35.44 $ 30.04 $ 26.94 $ 25.62
Weighted Average Exercise Price, Granted $ 57.22 $ 42.41 $ 34.23  
Weighted Average Exercise Price, Exercised $ 23.10 $ 20.84 $ 17.64  
Weighted Average Exercise Price, Canceled $ 47.20 $ 41.94 $ 39.04