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Fair Value Measurements (Tables)
 12 Months Ended
Jul. 31, 2015
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, 2015            
Assets:            
Available-for-sale securities $6,505  $33,782  $—  $40,287 
Foreign exchange forwards  —   38   —   38 
Total $6,505  $33,820  $—  $40,325 
Liabilities:                
Foreign exchange forwards $—  $39  $—  $39 
                 
July 31, 2014                
Assets:                
Available-for-sale securities $—  $12,873  $—  $12,873