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Fair Value Measurements - (Details) - USD ($)
$ in Thousands
Apr. 30, 2023
Apr. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities $ 0 $ 24,716
Recurring basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities   24,716
Equity securities 4,714  
Warrants 255  
Contingently returnable consideration   143
Total 4,969 24,859
Contingent consideration 2,109 1,084
Total 2,109 1,084
Recurring basis | Quoted prices in active market for identical assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 4,714  
Total 4,714  
Recurring basis | Significant other observable inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available for sale securities   24,716
Warrants 255  
Total 255 24,716
Recurring basis | Significant unobservable inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingently returnable consideration   143
Total   143
Contingent consideration 2,109 1,084
Total $ 2,109 $ 1,084