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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021 | Apr. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 1,006 | $ 1,316 | $ 3,399 | $ 3,543 |
Liability for payment of the RSTUs | 47,413 |  | $ 47,413 |  | $ 58,577
Employee Service-Based RSUs [Member] | 2016 employee stock incentive plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (shares) |  |  | 41,304 |  |
Employee Performance-Based RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock issuable per RSU granted (shares) |  |  | 1 |  |
Employee Performance-Based RSUs | 2016 employee stock incentive plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (shares) |  |  | 57,476 |  |
Employee Performance-Based RSTUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units non vested grants (shares) |  |  | 5,794 |  |
Employee Service-Based RSTUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units non vested grants (shares) |  |  | 3,096 |  |
RSTUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 0 | $ 200 | $ 0 | $ 600 |
Liability for payment of the RSTUs | $ 700 |  | $ 700 |  | $ 1,000
Cliff Vest | RSUs | 2016 employee stock incentive plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 3 years |  |
Cliff Vest | RSTUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 3 years |  |
Daily Vest | RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 2 years |  |

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