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Deferred Compensation and Retirement Plans - Weighted-Average Assumptions Used In Calculating The Medical and Life Insurance Plan (Detail) - Medical And Life Insurance Benefits - Hay Group | Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
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Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Discount rate, beginning of year | 5.62% | 4.85% | 4.25% | 2.54%
Discount rate, end of year | 5.62% | 4.85% | 4.25% | 2.54%
Healthcare care cost trend rate | 6.50% | 6.50% | 6.00% |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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