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Employee Benefit and Retirement Plans (Narrative) (Details) | 12 Months Ended
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Apr. 30, 2022 USD ($) plan | Apr. 30, 2021 USD ($) | Apr. 30, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognized expenses for profit-sharing contributions | $ 800,000 | $ 2,900,000 | $ 3,700,000
401(k) contributions, percent match of employee's annual contribution |  |  | 100.00%
Effective maximum contribution of base earnings |  |  | 4.00%
Number of defined benefit pension plans | plan | 2 |  |
Accumulated other comprehensive loss, net of tax | $ (10,225,000) | 54,568,000 |
Accumulated benefit obligation | 0 | 196,500,000 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | $ 0 | 500,000 |
Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percent of after tax earnings contributed in profit sharing | 0.00% |  |
Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Percent of after tax earnings contributed in profit sharing | 5.00% |  |
401(k) Plan [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expense for 401(k) matching contributions | $ 11,700,000 | $ 11,900,000 | $ 10,100,000

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