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Deferred Compensation and Retirement Plans - Components of Net Periodic Benefits Costs (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2024 | Jul. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |
Expected long-term rate of return on plan assets | 6.00% | 6.00%
Deferred Compensation Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | $ 10,655,000 | $ 9,833,000
Interest cost | 4,451,000 | 3,357,000
Amortization of actuarial loss | 32,000 | 184,000
Expected return on plan assets | (266,000) | (272,000)
Net periodic service credit amortization | (101,000) | (101,000)
Net periodic benefit costs | $ 14,771,000 | $ 13,001,000

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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