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Stock-Based Compensation (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 30, 2017 | Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2017
Stock Based Compensation |  |  |  |  |
Stock based compensation expense |  | $ 6,932,000 | $ 6,227,000 | $ 6,985,000 |
Exercisable period from grant date |  | 3 years |  |  |
Options granted (in shares) |  | 0 | 0 | 0 |
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 |  | $ 0 |  |  |
Exercisable period from grant date | 3 years |  |  |  |
Fiscal 2017 LTIP | Performance based restricted stock units |  |  |  |  |
Stock Based Compensation |  |  |  |  |
Stock based compensation expense |  | $ 0 |  |  | $ 0
Exercisable period from grant date | 3 years |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120381028&loc=d3e5070-113901 + Details
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