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Stock-Based Compensation (Narrative) (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2015 USD ($) plan award shares | Apr. 30, 2014 USD ($) | Apr. 30, 2013 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of stock-based compensation plans | award | 2 |  |
Stock-based compensation expense, before income taxes | $ 3,497 | $ 3,295 | $ 3,509
Number of stock incentive plans | plan | 3 |  |
Shares available for awards | shares | 921,026 |  |
Contractual terms, years | 3 years 4 months |  |
Vesting period, years | 3 years |  |
Total fair value of options vested | $ 700 | 700 | 1,200
Total unrecognized compensation expense related to unvested stock options granted | $ 700 |  |
Expected to be recognized over a weighted average period | 1 year 8 months 12 days |  |
Cash received from options exercised | $ 14,300 | 14,700 | 5,900
Tax benefit realized from the tax deduction from option exercises | 2,800 | 2,000 | $ 700
Accrued compensation and related expenses | $ 30,120 | 28,156 |
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 | $ 2,700 |  |
Expected to be recognized over a weighted average period | 1 year 7 months |  |
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 | 10,416 |  |
Service-Based Restricted Stock Tracking Units (RSTUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares approved for grants | shares | 3,584 |  |
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 | 100 |
Vesting period, years | 3 years |  |
Accrued compensation and related expenses | $ 400 | $ 100 |

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