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Fair Value Measurements (Tables)
6 Months Ended
Jan. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of fair value on a recurring basis and where they are classified within the fair value hierarchy
   January 31, 2022 
   Level 1   Level 2   Level 3   Total 
Assets:  (unaudited, in thousands) 
Hedge funds  $
   $
   $5,025   $5,025 
Total  $
   $
   $5,025   $5,025 

 

   July 31, 2021 
   Level 1   Level 2   Level 3   Total 
Assets:  (in thousands) 
Hedge funds  $
   $
   $5,268   $5,268 
Total  $
   $
   $5,268   $5,268 

 

Schedule of changes in fair value of the assets measured at fair value on a recurring basis using significant unobservable inputs
   Three Months Ended
January 31,
   Six Months Ended
January 31,
 
   2022   2021   2022   2021 
   (unaudited, in thousands)   (unaudited, in thousands) 
Balance, beginning of period  $5,479   $6,454   $5,268   $7,510 
Liquidation of Hedge Fund Investments   
    
    
    (2,000)
Total gain included in earnings   (454)   2,489    (243)   3,433 
Balance, end of period  $5,025   $8,943   $5,025   $8,943