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Deferred Compensation and Retirement Plans - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2015 USD ($) Person | Apr. 30, 2014 USD ($) Person | Apr. 30, 2013 USD ($) | Apr. 30, 2012 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit obligation | $ 191,446,000 | $ 179,612,000 |  |
Recognized investment income | 8,829,000 | 9,498,000 | $ 7,556,000 |
Increase in market value of the underlying COLI investments | 10,509,000 | 8,242,000 | 6,502,000 |
Net CSV | 102,691,000 | 94,274,000 |  |
Csv Of Coli Contracts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Gross CSV | 172,300,000 | 167,200,000 |  |
Outstanding policy loans | 69,600,000 | 72,900,000 |  |
Total death benefits payable, net of loans | 216,500,000 | 214,200,000 |  |
Increase in market value of the underlying COLI investments | $ 10,509,000 | 8,242,000 | 6,502,000 |
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 |  |  |
Total benefit obligation | $ 5,262,000 | 4,424,000 | 4,536,000 | $ 4,214,000
Executive Capital Accumulation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit obligation | 99,461,000 | 89,308,000 | 75,913,000 |
Company's contributions | $ 19,100,000 | 17,200,000 | 20,000,000 |
Deferred compensation arrangement vesting period | 4 years |  |  |
Gain on investment | $ 5,871,000 | 8,884,000 | 6,300,000 |
Company's contributions, unamortized portion | 29,700,000 | 28,300,000 |  |
International Retirement Plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total benefit obligation | $ 2,847,000 | $ 3,727,000 |  |
Long-term benefit obligation accrued, number of participants | Person | 393 | 383 |  |
Company's contributions | $ 500,000 | $ 600,000 |  |
Defined Contribution Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Company's matching contributions | $ 1,600,000 | 1,200,000 | 0 |
Percentage contribution by the participants to defined contribution plan | 50.00% |  |  |
Company Owned Life Insurance Held In Trust | Csv Of Coli Contracts |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net CSV | $ 72,200,000 |  |  |
Total death benefits payable, net of loans held in trust | 123,800,000 |  |  |
Deferred Compensation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Deferred compensation and pension plans in periodic benefit expense cost expected to be recognized | 2,900,000 |  |  |
Total benefit obligation | $ 83,876,000 | $ 82,153,000 | $ 85,562,000 | $ 78,479,000

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