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Deferred Compensation and Retirement Plans - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |
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Apr. 30, 2014 | Apr. 30, 2013 | Apr. 30, 2012 | Apr. 30, 2014 Csv Of Coli Contracts | Apr. 30, 2013 Csv Of Coli Contracts | Apr. 30, 2014 Enhanced Wealth Accumulation Plan | Apr. 30, 2014 Senior Executive Incentive Plan | Apr. 30, 2014 Pension Plans, Defined Benefit | Apr. 30, 2013 Pension Plans, Defined Benefit | Apr. 30, 2012 Pension Plans, Defined Benefit | Apr. 30, 2011 Pension Plans, Defined Benefit | Apr. 30, 2014 Executive Capital Accumulation Plan | Apr. 30, 2013 Executive Capital Accumulation Plan | Apr. 30, 2012 Executive Capital Accumulation Plan | Apr. 30, 2014 International Retirement Plans Person | Apr. 30, 2013 International Retirement Plans Person | Apr. 30, 2014 Defined Contribution Plan | Apr. 30, 2013 Defined Contribution Plan | Apr. 30, 2012 Defined Contribution Plan | Apr. 30, 2014 Company Owned Life Insurance Held In Trust Csv Of Coli Contracts | Apr. 30, 2014 Deferred Compensation Plan | Apr. 30, 2013 Deferred Compensation Plan | Apr. 30, 2012 Deferred Compensation Plan | Apr. 30, 2011 Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participant contribution period towards deferred compensation plans (in years) |  |  |  |  |  | 8 years | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participant after tax contribution period towards deferred compensation plans (in years) |  |  |  |  |  | 15 years | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional deferred units to acquire (in years) |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Participant employment term, maximum years |  |  |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation and pension plans in periodic benefit expense cost expected to be recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100,000 |  |  |
Total benefit obligation | 179,612,000 | 169,657,000 |  |  |  |  |  | 4,424,000 | 4,536,000 | 4,214,000 | 3,952,000 | 89,308,000 | 75,913,000 | 71,134,000 | 3,727,000 | 3,646,000 |  |  |  |  | 82,153,000 | 85,562,000 | 78,479,000 | 70,319,000
Long-term benefit obligation accrued, number of participants |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 267 | 221 |  |  |  |  |  |  |  |
Company's contributions |  |  |  |  |  |  |  |  |  |  |  | 17,200,000 | 20,000,000 | 15,800,000 | 500,000 | 1,100,000 |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  | 8,884,000 | 6,281,000 | 900,000 |  |  |  |  |  |  |  |  |  |
Recognized investment income | 9,498,000 | 7,556,000 | 1,013,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's contributions, unamortized portion |  |  |  |  |  |  |  |  |  |  |  | 28,300,000 | 23,300,000 |  |  |  |  |  |  |  |  |  |  |
Company's matching contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 | 0 | 0 |  |  |  |  |
Percentage contribution by the participants to defined contribution plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Gross CSV |  |  |  | 167,200,000 | 159,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding policy loans |  |  |  | 72,900,000 | 73,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total death benefits payable, net of loans |  |  |  | 214,200,000 | 212,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in market value of the underlying COLI investments | 8,242,000 | 6,502,000 | 6,268,000 | 8,242,000 | 6,502,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net CSV | 94,274,000 | 85,873,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,100,000 |  |  |  |
Total death benefits payable, net of loans held in trust |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,600,000 |  |  |  |

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- Definition The amount of Company contributions that is unamortized but will be expensed in future period once the conditions are met. + References No definition available. + Details
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- Definition The amount recorded in compensation expense as a result of an increase or decrease in the market value of the underlying COLI investments. + References No definition available. + Details
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- Definition Number of years the participant will receive payments from the plan once the participant meets the requirements under the plan. + References No definition available. + Details
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- Definition The number of years that the participant is required to contribute into the plan. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6812-107765 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement. + References No definition available. + Details
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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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