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Deferred Compensation and Retirement Plans - Reconciliation of Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Current liability | $ 17,818 | $ 21,991 |
Non-current liability | 257,635 | 227,729 |
Total benefit obligation | 275,453 | 249,720 |
Medical and Life Insurance plan | Hay Group |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation, beginning of year | 7,157 | 12,147 |
Plan amendment |  | (4,008) |
Service cost |  | 91 | $ 150
Interest cost | 243 | 369 | 431
Actuarial loss (gain) | 520 | (875) |
Benefits paid | (610) | (567) |
Benefit obligation, end of year | 7,310 | 7,157 | $ 12,147
Current liability | 643 | 668 |
Non-current liability | 6,667 | 6,489 |
Total benefit obligation | $ 7,310 | $ 7,157 |

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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