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Stock-Based Compensation (Details) - USD ($) | 12 Months Ended
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Apr. 30, 2020 | Apr. 25, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Stock Based Compensation |  |  |  |
Stock based compensation expense | $ 6,227,000 |  | $ 6,985,000 | $ 4,956,000
Performance based restricted stock units | Maximum |  |  |  |
Stock Based Compensation |  |  |  |
Stock based compensation expense | $ 4,263,000 |  |  |
Restated 2006 Plan |  |  |  |
Stock Based Compensation |  |  |  |
Maximum number of shares that may be granted to one participant during any twelve month period | 2,000,000 |  |  |
Maximum amount that may be paid in cash as a performance-based award to one participant during any twelve month period | $ 5,000,000 |  |  |
Restated 2006 Plan | Maximum |  |  |  |
Stock Based Compensation |  |  |  |
Number of shares authorized to be issued pursuant to awards | 4,884,157 |  |  |
Restated 2006 Plan | Incentive stock options | Minimum |  |  |  |
Stock Based Compensation |  |  |  |
Percentage of the fair market value on date of grant | 100.00% |  |  |
2002 Plan | Stock options |  |  |  |
Stock Based Compensation |  |  |  |
Exercisable period from grant date | 5 years |  |  |
Number of awards that may be granted | 0 |  |  |
1992 Plan | Stock options |  |  |  |
Stock Based Compensation |  |  |  |
Exercisable period from grant date | 5 years |  |  |
Fiscal 2018 LTIP | Performance based restricted stock units |  |  |  |
Stock Based Compensation |  |  |  |
Stock based compensation expense | $ 193,000 |  | 588,000 | $ 269,000
Fiscal 2017 LTIP |  |  |  |
Stock Based Compensation |  |  |  |
Stock based compensation expense |  | $ 0 | $ 0 |

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