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Deferred Compensation and Retirement Plans - Additional Information (Detail) | 12 Months Ended
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Apr. 30, 2019 USD ($) Person | Apr. 30, 2018 USD ($) Person | Apr. 30, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Recognized investment income(expense) | $ 8,134,000 | $ 10,278,000 | $ 10,842,000
Increase in market value of the underlying COLI investments | 6,160,000 | 7,776,000 | 4,918,000
Net CSV | 126,000,000 | 120,087,000 |
CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Outstanding policy loans | 93,200,000 | 66,700,000 |
Total death benefits payable, net of loans | 223,600,000 | 226,000,000 |
Increase in market value of the underlying COLI investments | 6,200,000 | 7,800,000 | 4,900,000
Net CSV | $ 126,000,000 | 120,100,000 |
Equity Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 40.00% |  |
Equity Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 50.00% |  |
Debt Securities | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 45.00% |  |
Debt Securities | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 55.00% |  |
Other Assets | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 0.00% |  |
Other Assets | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Target allocation range | 10.00% |  |
Long Term Performance Unit Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Value per unit award | $ 50,000 |  |
Annual Benefit Payments per vested unit after anniversary period | $ 25,000 |  |
Number of payments after the seventh anniversary of the grant date | 5 years |  |
Vesting percentage on each anniversary date | 25.00% |  |
Enhanced Wealth Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Participant contribution period towards deferred compensation plans (in years) | 8 years |  |
Participant after tax contribution period towards deferred compensation plans (in years) | 15 years |  |
Additional deferred units to acquire (in years) | 5 years |  |
Senior Executive Incentive Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Participant contribution period towards deferred compensation plans (in years) | 4 years |  |
Participant after tax contribution period towards deferred compensation plans (in years) | 15 years |  |
Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Participant employment term, maximum years | 20 years |  |
Medical and Life Insurance plan | Hay Group |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit plan, number of participants | Person | 126 |  |
Reduction in benefit obligation |  | (4,008,000) |
Total benefit obligation | $ 7,310,000 | 7,157,000 | 12,147,000
International Retirement Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation | $ 14,700,000 | $ 13,700,000 |
Long-term benefit obligation accrued, number of participants | Person | 2,777 | 2,423 |
Company's contributions | $ 13,300,000 | $ 11,800,000 |
Executive Capital Accumulation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation | 130,161,000 | 128,430,000 | 111,584,000
Company's contributions | 8,500,000 | 6,200,000 | 6,200,000
Gain (loss) on deferred compensation plan | 8,700,000 | 11,100,000 | 10,600,000
Company's contributions, unamortized portion | $ 16,800,000 | 19,200,000 |
Executive Capital Accumulation Plan | Minimum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferred compensation arrangement vesting period | 4 years |  |
Executive Capital Accumulation Plan | Maximum |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferred compensation arrangement vesting period | 5 years |  |
Defined Contribution Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Company's matching contributions | $ 2,700,000 | 2,300,000 |
Percentage contribution by the participants to defined contribution plan | 50.00% |  |
Deferred Compensation Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total benefit obligation | $ 148,369,000 | 126,494,000 | $ 121,042,000
Deferred Compensation Plan | CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gross CSV | 219,200,000 | 186,800,000 |
Outstanding policy loans | 93,200,000 | $ 66,700,000 |
Company Owned Life Insurance Held In Trust | CSV of COLI Contracts |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Net CSV | 115,700,000 |  |
Total death benefits, net of loans held in trust | $ 178,700,000 |  |

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