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Fair Value Measurements (Tables)
12 Months Ended
Jul. 31, 2014
Fair Value Measurements [Abstract]  
Summary of Assets Measured at Fair Value on Recurring Basis
in thousands) Level 1  Level 2  Level 3  Total 
July 31, 2014            
Available-for-sale securities $  $12,873  $  $12,873 
July 31, 2013                
Available-for-sale securities $  $9,684  $  $9,684