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Investments in Affiliates (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Investments in equity method affiliates $ 7.1 $ 6.9  
Undistributed earnings of equity method affiliates 3.8 3.6  
Distributions received from equity method affiliates $ 0.7 $ 0.8 $ 1.0
Slifer, Smith, and Frampton/Vail Associates Real Estate, LLC ("SSF/VARE") [Member]
     
Ownership interest 50.00%    
KRED [Member]
     
Ownership interest 50.00%    
Clinton Ditch and Reservoir Company [Member]
     
Ownership interest 43.00%