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Fair Value Measurements (Tables)
 9 Months Ended
Apr. 30, 2017
Fair Value Measurements [Abstract]  
Summary of balance of assets and liabilities measured at fair value on a recurring basis
  Level 1 (1)  Level 2 (2)  Level 3 (3)  Total 
  (in thousands) 
April 30, 2017            
Assets:            
Available-for-sale securities $13,149  $47,672  $        —  $60,821 
July 31, 2016                
Assets:                
Available-for-sale securities $12,445  $40,504  $—  $52,949 

 

(1) – quoted prices in active markets for identical assets or liabilities

 

(2) – observable inputs other than quoted prices in active markets for identical assets and liabilities

 

(3) – no observable pricing inputs in the market