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Deferred Compensation And Retirement Plans - Reconciliation Of Benefit Obligation (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit obligation |  | $ 308,279 | $ 275,453 |
Deferred Compensation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation, beginning of year |  | 148,369 | 126,494 |
Service cost |  | 24,939 | 17,281 | $ 11,373
Interest cost |  | 5,433 | 5,044 | 3,787
Actuarial loss |  | 13,427 | 7,803 |
Administrative expenses paid |  | (155) | (272) |
Benefits paid from plan assets | [1] | (3,932) | (1,877) |
Benefits paid from cash |  | (6,652) | (6,104) |
Plan amendment |  | (608) |  |
Benefit obligation, end of year |  | 180,821 | 148,369 | 126,494
Fair value of plan assets, beginning of year |  | 25,131 | 26,090 |
Actual return on plan assets |  | 2,726 | 1,160 |
Benefits paid from plan assets | [1] | (3,932) | (1,877) |
Administrative expenses paid |  | (155) | (272) |
Employer contributions |  | 465 | 30 |
Fair value of plan assets, end of year |  | 24,235 | 25,131 | 26,090
Funded status and balance, end of year | [2] | (156,586) | (123,238) |
Current liability |  | 8,887 | 8,331 |
Non-current liability |  | 147,699 | 114,907 |
Total benefit obligation |  | $ 156,586 | $ 123,238 |
Plan assets weighted average allocation |  | 100.00% | 100.00% |
Deferred Compensation Plan | Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 43.00% | 54.00% |
Deferred Compensation Plan | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 56.00% | 45.00% |
Deferred Compensation Plan | Other securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 1.00% | 1.00% |
Executive Capital Accumulation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation, beginning of year |  | $ 130,161 | $ 128,430 |
Employee contributions |  | 8,215 | 4,852 |
Amortization of employer contributions |  | 6,074 | 9,573 |
Gain on investment |  | (826) | 8,697 |
Benefits paid from cash |  | (13,911) | (20,891) |
Exchange rate fluctuations |  | (398) | (500) |
Benefit obligation, end of year |  | 129,315 | 130,161 | $ 128,430
Current liability |  | 9,590 | 8,844 |
Non-current liability |  | 119,725 | 121,317 |
Total benefit obligation |  | $ 129,315 | $ 130,161 |
[1] | The Company amended the Hay Group qualified plan in fiscal 2020 to allow participants that have yet not received benefits to elect a lump-sum payment rather than an annuity payment. As a result of this plan amendment the benefits paid from plan assets include $2.0 million in payments related to participants making this election. The plan amendment also reduced the Company’s benefit obligation by $0.6 million against other comprehensive income.
[2] | The Company purchased COLI contracts insuring the lives of certain employees eligible to participate in the deferred compensation and pension plans as a means of funding benefits under such plans. As of April 30, 2020 and 2019, the Company held contracts with gross CSV of $238.7 million and $219.2 million, offset by outstanding policy loans of $92.3 million and $93.2 million, respectively

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