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Stock-Based Compensation (Narrative) (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 USD ($) plan group performance_period award shares | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employee groups | group | 1 |  |
Number of stock-based compensation plans | award | 2 |  |
Stock-based compensation expense, before income taxes | $ 3,097 | $ 3,469 | $ 3,609
Number of stock incentive plans | plan | 3 |  |
Shares available for awards | shares | 841,504 |  |
Contractual terms, years | 2 years 1 month 6 days |  |
Vesting period, years | 3 years |  |
Total fair value of options vested | $ 300 | 600 | 700
Cash received from options exercised | 1,300 | 2,400 | 8,100
Tax benefit realized from the tax deduction from option exercises | 0 | 1,000 | 4,300
Accrued compensation and related expenses | $ 48,682 | 36,162 |
Non Employee Directors [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual terms, years | 4 years |  |
Non Employee Directors [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual terms, years | 10 years |  |
Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual terms, years | 10 years |  |
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |
Stock Options [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Contractual terms, years | 10 years |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 3 years |  |
Total unrecognized compensation expense related to unvested stock options granted | $ 4,900 |  |
Expected to be recognized over a weighted average period | 1 year 7 months 6 days |  |
Number of performance periods | performance_period | 3 |  |
Performance period | 1 year |  |
Period to achieve cultural goals | 3 years |  |
Employee And Non Employee Director Service Based Restricted Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period, years | 2 years |  |
Performance-Based Restricted Stock Tracking Units (RSTUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares approved for grants | shares | 4,496 |  |
Service-Based Restricted Stock Tracking Units (RSTUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares approved for grants | shares | 2,519 |  |
Restricted Stock Tracking Units (RSTUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense, before income taxes | $ 400 | 800 | $ 800
Vesting period, years | 3 years |  |
Accrued compensation and related expenses | $ 1,000 | $ 1,500 |

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