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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2018 | Jan. 31, 2017 | Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 897 | $ 827 | $ 2,506 | $ 2,477 |
Liability for payment of the RSTUs | $ 46,712 |  | $ 46,712 |  | $ 36,162
Employee Service-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (in shares) |  |  | 22,250 |  |
Employee Performance-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Awarded in period (in shares) |  |  | 33,080 |  |
Common stock issuable per RSU granted (in shares) |  |  | 1 |  |
Employee and Non Employee Director Service-Based RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Granted non-statutory stock options to key employees (in shares) |  |  |  |  |
RSUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  |  |  |
Non-Employee Service-Based Restricted Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  |  |  |
Employee Performance-Based RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units non vested grants (in shares) |  |  | 4,496 |  |
Employee Service-Based RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Restricted stock units non vested grants (in shares) |  |  | 2,519 |  |
RSTUs [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting period, years |  |  | 3 years |  |
Stock-based compensation expense | $ 600 | $ 100 | $ 1,000 | $ 300 |
Liability for payment of the RSTUs | $ 1,600 |  | $ 1,600 |  | $ 1,500
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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