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Stock-Based Compensation (Narrative) (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2017 USD ($) plan award shares | Apr. 30, 2016 USD ($) | Apr. 30, 2015 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 | $ 3,469 | $ 3,609 | $ 3,497
Number of stock incentive plans | plan | 4 |  |
Shares available for awards | shares | 881,010 |  |
Contractual terms, years | 1 year 4 months 24 days |  |
Vesting period, years | 3 years |  |
Total fair value of options vested | $ 600 | 700 | 700
Total unrecognized compensation expense related to unvested stock options granted | $ 200 |  |
Expected to be recognized over a weighted average period | 1 year |  |
Cash received from options exercised | $ 2,400 | 8,100 | 14,300
Tax benefit realized from the tax deduction from option exercises | 1,000 | 4,300 | 2,800
Accrued compensation and related expenses | $ 36,162 | 35,389 |
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 | $ 3,400 |  |
Expected to be recognized over a weighted average period | 1 year 7 months 6 days |  |
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 | 5,136 |  |
Service-Based Restricted Stock Tracking Units (RSTUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares approved for grants | shares | 2,804 |  |
Restricted Stock Tracking Units (RSTUs) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense, before income taxes | $ 800 | 800 | $ 400
Vesting period, years | 3 years |  |
Accrued compensation and related expenses | $ 1,500 | $ 1,200 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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