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Compensation Related Costs and Share Based Payments - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended
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Jan. 31, 2022 | Jan. 31, 2021
Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Number of shares available for grant reduction per stock option issued (in shares) | 1 |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Number of shares available for grant reduction per equity instruments other options issued (in shares) | 2 |
Stock Incentive Plans | Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Earnings before interest, tax, depreciation and amortization measurement period | 3 years |
Total shareholder return measurement period | 3 years |
Return on invested capital measurement period | 3 years |
Allocated share-based compensation expense | $ 29,382 | $ 22,009
Unrecognized compensation costs related to plan | $ 38,799 |
2018 Stock Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Number of shares available for grant (in shares) | 1,975,638 |
2018 Stock Plan | Employee Stock Option |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |
Granted (in shares) | 0 |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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