Deferred Compensation and Retirement Plans - Components of Net Periodic Benefits Costs (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Jul. 31, 2023 |
Jul. 31, 2022 |
|
| Defined Benefit Plan Disclosure [Line Items] | ||
| Expected long-term rate of return on plan assets | 6.00% | 5.50% |
| Deferred Compensation Plan | ||
| Defined Benefit Plan Disclosure [Line Items] | ||
| Service cost | $ 9,833,000 | $ 9,143,000 |
| Interest cost | 3,357,000 | 2,387,000 |
| Amortization of actuarial loss | 184,000 | 218,000 |
| Expected return on plan assets | (272,000) | (289,000) |
| Net periodic service credit amortization | (101,000) | (101,000) |
| Net periodic benefit costs | $ 13,001,000 | $ 11,358,000 |
| X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- Details
|