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Fair Value Measurements - (Details) - USD ($) $ in Thousands	Oct. 31, 2020	Apr. 30, 2020
Fair Value Measurement
Available for sale securities	$ 82,778	$ 58,095
Recurring basis
Fair Value Measurement
Available for sale securities	82,778	58,095
Total	82,778	58,095
Recurring basis | Significant other observable inputs (Level 2)
Fair Value Measurement
Available for sale securities	82,778	58,095
Total	$ 82,778	$ 58,095

X

- Definition

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

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