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Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis - Fair Value Measurements, Recurring basis [Member] - USD ($)
$ in Thousands
Jul. 31, 2020
Jul. 31, 2019
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items]    
Debt securities $ 18,363 $ 2,534
Equity investments included in current assets 5,964 5,688
Equity investments included in noncurrent assets 3,825 3,619
TOTAL 28,152 11,841
Contingent consideration included in other noncurrent liabilities (see Note 5) (396)  
Level 1 [Member]    
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items]    
Debt securities 2,498
Equity investments included in current assets 5,964 5,688
Equity investments included in noncurrent assets
TOTAL 8,462 5,688
Contingent consideration included in other noncurrent liabilities (see Note 5)  
Level 2 [Member]    
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items]    
Debt securities 15,865 2,534
Equity investments included in current assets
Equity investments included in noncurrent assets
TOTAL 15,865 2,534
Contingent consideration included in other noncurrent liabilities (see Note 5)  
Level 3 [Member]    
Fair Value Measurements (Details) - Schedule of balance of assets measured at fair value on a recurring basis [Line Items]    
Debt securities
Equity investments included in current assets
Equity investments included in noncurrent assets 3,825 3,619
TOTAL 3,825 $ 3,619
Contingent consideration included in other noncurrent liabilities (see Note 5) $ (396)