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FAIR VALUE MEASUREMENTS (Tables)
 9 Months Ended
Apr. 30, 2014
FAIR VALUE MEASUREMENTS  
Schedule of assets and liabilities that are measured at fair value on a recurring basis

   The following tables include our assets and liabilities that are measured at fair value on a recurring basis (in thousands):

 
   Fair Value as of April 30,
2014		  
 
   Level 1   Level 2   Level 3  

Assets

                    

U.S. Treasury securities

   $ 9,941   $ —   $ —  

U.S. government agency securities

     —     2,044     —  

Corporate bonds and notes

     —     6,841     —  

Corporate equity securities

     2,486     —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 12,427   $ 8,885   $ —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               

Liabilities

                    

Interest rate swaps

   $ —   $ 2,689   $ —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
               


 

 
   Fair Value as of April 30,
2013		  
 
   Level 1   Level 2   Level 3  

Assets

                    

U.S. Treasury securities

   $ 19,572   $ —   $ —  

U.S. government agency securities

     —     2,800     —  

Corporate bonds and notes

     —     866     —  

Corporate equity securities

     4,700     —     —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

 

   $ 24,272   $ 3,666   $ —  
               
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​