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Fair Value Measurements - (Details) - USD ($) $ in Thousands | Jul. 31, 2021 | Apr. 30, 2021
--- | --- | ---
Fair Value Measurement |  |
Available for sale securities | $ 18,940 | $ 36,959
Recurring basis |  |
Fair Value Measurement |  |
Available for sale securities | 18,940 | 36,959
Contingent consideration | 6,475 | 5,521
Total | 25,415 | 42,480
Recurring basis | Significant other observable inputs (Level 2) |  |
Fair Value Measurement |  |
Available for sale securities | 18,940 | 36,959
Total | 18,940 | 36,959
Recurring basis | Significant unobservable inputs (Level 3) |  |
Fair Value Measurement |  |
Contingent consideration | 6,475 | 5,521
Total | $ 6,475 | $ 5,521

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