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Deferred Compensation And Retirement Plans (Narrative) (Detail) (USD $)
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12 Months Ended | 12 Months Ended | ||||||||||||||||||
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Apr. 30, 2013
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Apr. 30, 2012
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Apr. 30, 2011
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Apr. 30, 2013
Csv Of Coli Contracts
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Apr. 30, 2012
Csv Of Coli Contracts
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Apr. 30, 2013
Enhanced Wealth Accumulation Plan
Y
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Apr. 30, 2012
Senior Executive Incentive Plan
Y
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Apr. 30, 2013
Pension Plans, Defined Benefit
Y
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Apr. 30, 2012
Pension Plans, Defined Benefit
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Apr. 30, 2011
Pension Plans, Defined Benefit
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Apr. 30, 2010
Pension Plans, Defined Benefit
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Apr. 30, 2013
International Retirement Plans
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Apr. 30, 2012
International Retirement Plans
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Apr. 30, 2013
Executive Capital Accumulation Plan
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Apr. 30, 2012
Executive Capital Accumulation Plan
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Apr. 30, 2011
Executive Capital Accumulation Plan
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Apr. 30, 2013
Defined Contribution Plan
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Apr. 30, 2012
Defined Contribution Plan
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Apr. 30, 2011
Defined Contribution Plan
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Apr. 30, 2013
Company Owned Life Insurance Held In Trust
Csv Of Coli Contracts
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| Defined Benefit Plan Disclosure [Line Items] | ||||||||||||||||||||
| Participant contribution period towards deferred compensation plans (in years) | 8 | 4 | ||||||||||||||||||
| Participant after tax contribution period towards deferred compensation plans (in years) | 15 | 15 | ||||||||||||||||||
| Additional deferred units to acquire (in years) | 5 | |||||||||||||||||||
| Participant employment term, maximum years | 20 | |||||||||||||||||||
| Change in discount rate | 3.79% to 3.12% | 4.94% to 3.79% | ||||||||||||||||||
| Increase in deferred compensation and pension plan liabilities | $ 7,500,000 | $ 8,800,000 | ||||||||||||||||||
| Decrease in accumulated other comprehensive income | 4,578,000 | 5,644,000 | 4,048,000 | |||||||||||||||||
| Net increase in deferred income tax assets | 2,900,000 | 3,200,000 | ||||||||||||||||||
| Total benefit obligation | 169,657,000 | 156,603,000 | 4,536,000 | 4,214,000 | 3,952,000 | 3,630,000 | 3,600,000 | 2,800,000 | 75,913,000 | 71,134,000 | 67,214,000 | |||||||||
| Long-term benefit obligation accrued, number of participants | 221 | 188 | ||||||||||||||||||
| Company's contributions | 1,100,000 | 1,100,000 | 20,000,000 | 15,800,000 | 400,000 | |||||||||||||||
| Deferred compensation arrangement vesting terms | The Company amortizes these contributions on a straight-line basis as they vest, generally over a four year period. | |||||||||||||||||||
| Gain on investment | 6,281,000 | 884,000 | 6,700,000 | |||||||||||||||||
| Company's contributions, unamortized portion | 23,300,000 | 11,500,000 | ||||||||||||||||||
| Company's matching contributions | 1,200,000 | |||||||||||||||||||
| Percentage contribution by the participants to defined contribution plan | 50.00% | 50.00% | ||||||||||||||||||
| Gross CSV | 159,200,000 | 151,100,000 | ||||||||||||||||||
| Outstanding policy loans | 73,300,000 | 73,300,000 | ||||||||||||||||||
| Total death benefits payable, net of loans | 212,700,000 | 202,900,000 | ||||||||||||||||||
| Increase in market value of the underlying COLI investments | 6,502,000 | 6,268,000 | 7,218,000 | 6,502,000 | 6,268,000 | |||||||||||||||
| Net CSV | 85,873,000 | 77,848,000 | 64,400,000 | |||||||||||||||||
| Total death benefits payable, net of loans held in trust | $ 123,900,000 | |||||||||||||||||||