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Stock-Based Compensation (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions | 12 Months Ended
--- | ---
Apr. 30, 2021 | Apr. 30, 2020 | Apr. 30, 2019
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Stock based compensation expense | $ 28,271 | $ 28,045 | $ 23,767
Tax benefit | 1,802 | 7,175 | 6,076
Realized tax benefit | $ 1,690 | 5,856 | 3,416
Shares reserved for future awards under stock-based compensation plans (in shares) | 11.2 |  |
Vesting period (in years), minimum | 3 years |  |
Maximum contractual term | 10 years |  |
Performance-Based Nonvested Share Units |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Vesting period (in years), minimum | 3 years |  |
Nonvested Shares |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Fair value of shares vesting during period | $ 16,100 | $ 22,100 | $ 17,900
Unrecognized compensation cost | $ 37,900 |  |
Weighted-average period of recognition (years) | 2 years |  |
Minimum | 2003 Long-Term Executive Compensation Plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Percentage of performance-based share units that ultimately vest | 0.00% |  |
Maximum | 2003 Long-Term Executive Compensation Plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Percentage of performance-based share units that ultimately vest | 20000.00% |  |

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