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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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- Definition

Fair value of contingent consideration assets in a business combination.

+ References

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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