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Deferred Compensation And Retirement Plans (Reconciliation Of Benefit Obligation) (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016 | Apr. 30, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Total liability |  | $ 231,348 | $ 234,059 |
Deferred Compensation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation, beginning of period |  | 124,566 | 89,138 | $ 86,577
Service cost |  | 5,507 |  |
Interest cost |  | 3,820 | 3,423 | 2,989
Actuarial (gain) loss |  | (4,791) | 4,393 | 5,864
Acquisitions |  |  | 39,079 |
Settlements |  |  | (4,799) |
Benefits paid from plan assets |  | (1,884) | (595) |
Benefits paid from cash |  | (6,176) | (6,073) | (6,292)
Benefit obligation, end of year |  | 121,042 | 124,566 | 89,138
Fair value of plan assets, beginning of year |  | 24,867 |  |
Actual return on plan assets |  | 2,463 | (78) |
Benefits paid from plan assets |  | (1,884) | (595) |
Acquisitions |  |  | 25,540 |
Fair value of plan assets, end of year |  | 25,446 | 24,867 |
Funded status and balance, end of year | [1] | (95,596) | (99,699) | (89,138)
Current liability |  | 6,182 | 5,845 | 5,832
Non-current liability |  | 89,414 | 93,854 | 83,306
Total liability |  | $ 95,596 | $ 99,699 | 89,138
Plan assets weighted average allocation |  | 100.00% | 100.00% |
Deferred Compensation Plan | Equity Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 54.00% | 64.00% |
Deferred Compensation Plan | Debt Securities |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  | 46.00% | 31.00% |
Deferred Compensation Plan | Other |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Plan assets weighted average allocation |  |  | 5.00% |
Executive Capital Accumulation Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Benefit obligation, beginning of period |  | $ 105,676 | $ 99,461 |
Employee contributions |  | 5,349 | 7,015 |
Amortization of employer contributions |  | 13,667 | 16,439 |
Gain (loss) on investment |  | 10,565 | (1,654) | 5,900
Benefits paid from cash |  | (23,044) | (15,201) |
Exchange rate fluctuations |  | (629) | (384) |
Benefit obligation, end of year |  | 111,584 | 105,676 | $ 99,461
Current liability |  | 4,496 | 11,092 |
Non-current liability |  | 107,088 | 94,584 |
Total liability |  | $ 111,584 | $ 105,676 |
[1] | The Company purchased COLI contracts insuring the lives of certain employees eligible to participate in the deferred compensation and pension plans as a means of funding benefits under such plans. As of April 30, 2017, 2016 and 2015, the Company held contracts with gross CSV of $180.3 million, $175.7 million and $172.3 million, offset by outstanding policy loans of $67.2 million, $68.4 million and $69.6 million, respectively.

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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost) -URI http://asc.fasb.org/extlink&oid=6504192 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost) -URI http://asc.fasb.org/extlink&oid=6504226 + Details
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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Gain or Loss -URI http://asc.fasb.org/extlink&oid=49168827 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + 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=65897934&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 The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=49170737 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + 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 (h)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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