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Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2020 | Apr. 30, 2019
CSV of COLI Contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Outstanding policy loans | $ 92,300 | $ 93,200
Deferred Compensation Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Reduction in benefit obligation | (608) |
Deferred Compensation Plan | CSV of COLI Contracts |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Gross CSV | 238,700 | 219,200
Outstanding policy loans | 92,300 | $ 93,200
Deferred Compensation Plan | Hay Group |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Reduction in benefit obligation | (600) |
Payments related to participants making this election | $ 2,000 |

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- Definition Defined benefit plan, plan assets including payments related to participants making this election. + References No definition available. + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new 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)(7) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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