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Schedule of Balance of Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Apr. 30, 2021
Jul. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities $ 16,852 $ 18,363
Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities 16,852 18,363
Equity investments included in current assets 37,586 5,964
Equity investments included in noncurrent assets 5,263 3,825
Total 59,701 28,152
Contingent consideration included in other noncurrent liabilities (795) (396)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities [1] 1,644 2,498
Equity investments included in current assets [1] 26,759 5,964
Equity investments included in noncurrent assets [1]
Total [1] 28,403 8,462
Contingent consideration included in other noncurrent liabilities [1]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities [2] 15,208 15,865
Equity investments included in current assets [2] 10,827
Equity investments included in noncurrent assets [2] 2,920
Total [2] 28,955 15,865
Contingent consideration included in other noncurrent liabilities [2]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities [3]
Equity investments included in current assets [3]
Equity investments included in noncurrent assets [3] 2,343 3,825
Total [3] 2,343 3,825
Contingent consideration included in other noncurrent liabilities $ (795) [3] $ (396)
[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