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Deferred Compensation And Retirement Plans (Narrative) (Detail) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended |
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Apr. 30, 2012 | Apr. 30, 2011 | Apr. 30, 2010 | Apr. 30, 2012 Enhanced Wealth Accumulation Plan [Member] Year | Apr. 30, 2012 Senior Executive Incentive Plan [Member] Year | Apr. 30, 2012 Pension Plan [Member] Year | Apr. 30, 2011 Pension Plan [Member] | Apr. 30, 2010 Pension Plan [Member] | Apr. 30, 2009 Pension Plan [Member] | Apr. 30, 2012 International Retirement Plans [Member] | Apr. 30, 2011 International Retirement Plans [Member] | Apr. 30, 2012 Executive Capital Accumulation Plan [Member] | Apr. 30, 2011 Executive Capital Accumulation Plan [Member] | Apr. 30, 2010 Executive Capital Accumulation Plan [Member] | Apr. 30, 2012 Defined Contribution Plan [Member] | Apr. 30, 2011 Defined Contribution Plan [Member] | Apr. 30, 2012 Company Owned Life Insurance Held In Trust [Member]
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 | 4.94% to 3.79% | 5.61% to 4.94% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in deferred compensation and pension plan liabilities | $ 8,800,000 | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Decrease in accumulated other comprehensive income | (5,644,000) | (4,048,000) | (8,728,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase in deferred income tax assets | 3,200,000 | 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total benefit obligation | 156,603,000 | 144,638,000 |  |  |  | 4,214,000 | 3,952,000 | 3,630,000 | 3,125,000 | 2,800,000 | 3,200,000 |  |  |  |  |  |
Long-term benefit obligation accrued, number of participants |  |  |  |  |  |  |  |  |  | 189 | 155 |  |  |  |  |  |
Company's contributions |  |  |  |  |  |  |  |  |  | 500,000 | 900,000 | 15,800,000 | 400,000 | 1,900,000 |  |  |
Deferred compensation arrangement vesting terms |  |  |  |  |  |  |  |  |  |  |  | Participants generally vest in Company contributions over a four year period. |  |  |  |  |
Gain on investment |  |  |  |  |  |  |  |  |  |  |  | 884,000 | 6,667,000 | 8,900,000 |  |  |
Company's contributions, unamortized portion |  |  |  |  |  |  |  |  |  |  |  | 11,500,000 | 4,900,000 |  |  |  |
Company's matching contributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000 |
Percentage contribution by the participants to defined contribution plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Gross CSV | 151,100,000 | 143,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding policy loans | 73,300,000 | 72,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total death benefits payable, net of loans | 202,900,000 | 195,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in market value of the underlying COLI investments | 6,268,000 | 7,218,000 | 9,424,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net CSV | 77,848,000 | 70,987,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,900,000
Total death benefits payable, net of loans held in trust | $ 117,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 45 -Paragraph 4 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6812-107765 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 FASB Technical Bulletin (FTB) -Number 85-4 -Paragraph 2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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 + 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 -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: 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=6962843&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 6 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph E1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amounts recognized in other comprehensive income (but not yet recognized in net periodic benefit cost), including the net gain (loss) and net prior service cost (credit) arising during the period. Also includes reclassification adjustments out of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 14, 17, 22, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 2 -Subparagraph (h)-(j) -URI http://asc.fasb.org/extlink&oid=6920433&loc=d3e998-108581 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph C3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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