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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total liability |  | $ 249,720 | $ 231,348 |
Deferred Compensation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation, beginning of period |  | 121,042 | 124,566 |
Service cost |  | 11,691 | 5,507 |
Interest cost |  | 3,469 | 3,820 | $ 3,423
Actuarial gain |  | (1,574) | (4,791) |
Administrative expenses paid |  | (166) |  |
Benefits paid from plan assets |  | (1,833) | (1,884) |
Benefits paid from cash |  | (6,135) | (6,176) |
Benefit obligation, end of year |  | 126,494 | 121,042 | 124,566
Fair value of plan assets, beginning of year |  | 25,446 | 24,867 |
Actual return on plan assets |  | 2,425 | 2,463 |
Benefits paid from plan assets |  | (1,833) | (1,884) |
Administrative expenses paid |  | (166) |  |
Employer contributions |  | 218 |  |
Fair value of plan assets, end of year |  | 26,090 | 25,446 | 24,867
Funded status and balance, end of year | [1] | (100,404) | (95,596) |
Current liability |  | 6,496 | 6,182 |
Non-current liability |  | 93,908 | 89,414 |
Total liability |  | $ 100,404 | $ 95,596 |
Plan assets weighted average allocation |  | 100.00% | 100.00% |
Deferred Compensation Plan | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 44.00% | 54.00% |
Deferred Compensation Plan | Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 55.00% | 46.00% |
Deferred Compensation Plan | Other securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 1.00% |  |
Executive Capital Accumulation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation, beginning of period |  | $ 111,584 | $ 105,676 |
Employee contributions |  | 5,036 | 5,349 |
Amortization of employer contributions |  | 12,175 | 13,667 |
Gain on investment |  | 11,095 | 10,565 |
Benefits paid from cash |  | (11,923) | (23,044) |
Exchange rate fluctuations |  | 463 | (629) |
Benefit obligation, end of year |  | 128,430 | 111,584 | $ 105,676
Current liability |  | 14,827 | 4,496 |
Non-current liability |  | 113,603 | 107,088 |
Total liability |  | $ 128,430 | $ 111,584 |
[1] | 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, 2018 and 2017, the Company held contracts with gross CSV of $186.8 million and $180.3 million, offset by outstanding policy loans of $66.7 million and $67.2 million, respectively.

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