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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities $ 12,948 $ 2,534
Equity investments included in current assets 5,716 5,688
Equity investments included in noncurrent assets 3,633 3,619
Total 22,297 11,841
Contingent consideration included in other noncurrent liabilities (see Note 8) 365  
Fair Value Measurements, Recurring basis [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities [1]
Equity investments included in current assets [1] 5,716 5,688
Equity investments included in noncurrent assets [1]
Total [1] 5,716 5,688
Contingent consideration included in other noncurrent liabilities (see Note 8) [1]  
Fair Value Measurements, Recurring basis [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities [2] 12,948 2,534
Equity investments included in current assets [2]
Equity investments included in noncurrent assets [2]
Total [2] 12,948 2,534
Contingent consideration included in other noncurrent liabilities (see Note 8) [2]  
Fair Value Measurements, Recurring basis [Member] | Level 3 [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] 3,633 3,619
Total [3] 3,633 $ 3,619
Contingent consideration included in other noncurrent liabilities (see Note 8) [3] $ 365  
[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