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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Jul. 31, 2021 | Jul. 31, 2020 | Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense | $ 1,177 | $ 961 |
Liability for payment of the RSTUs | $ 48,039 |  | $ 58,577
Employee Service-Based RSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awarded in period (shares) | 30,984 |  |
Employee Performance-Based RSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awarded in period (shares) | 57,476 |  |
Common stock issuable per RSU granted (shares) | 1 |  |
Employee Performance-Based RSTUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units non vested grants (shares) | 5,794 |  |
Employee Service-Based RSTUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock units non vested grants (shares) | 3,096 |  |
RSTUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |
Stock-based compensation expense | $ 100 | $ 300 |
Liability for payment of the RSTUs | $ 600 |  | $ 1,000
Cliff Vest [Member] | RSUs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |

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