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Employee Benefit and Retirement Plans (Narrative) (Details) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 USD ($) plan | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognized expenses for profit-sharing contributions | $ 3,700 | $ 3,600 | $ 2,900
401(k) contributions, percent match of employee's annual contribution |  |  | 100.00%
Effective maximum contribution of base earnings |  |  | 4.00%
Expense for 401(k) matching contributions |  |  |
Number of defined benefit pension plans | plan | 2 |  |
Accumulated other comprehensive loss | $ 66,100 |  |
Accumulated other comprehensive loss, net of tax | 49,069 | 40,417 |
Expected recognized net actuarial losses in net periodic pension benefit cost, before tax | 1,600 |  |
Expected recognized net actuarial losses in net periodic pension benefit cost, after tax | 1,200 |  |
Accumulated benefit obligation | 163,400 | 165,200 |
Expected company contributions to pension plan in 2015 | 2,300 |  |
Company contributions | $ 19,319 | $ 27,304 |
Plan asset actual allocation | 100.00% | 100.00% |
Bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset actual allocation | 60.00% |  |
Equity Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan asset actual allocation | 40.00% | 57.00% |
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] |  |  |
401(k) contributions, percent match of employee's annual contribution | 4.00% |  |
Expense for 401(k) matching contributions | $ 8,000 | $ 7,200 | $ 6,600
Eligibility period | 60 days |  |
Maximum annual contribution per employee (as a percent) | 60.00% |  |
ERROR in label resolution. |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined contribution plan, minimum age requirement | 18 years |  |
Defined contribution plan, minimum consecutive months employed requirement | 6 months |  |

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