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Retirement Benefits - Summary of Change in Projected Benefit Obligations and Change in Fair Value of Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Compensation and Retirement Disclosure [Abstract]
Accumulated Benefit Obligation, April 30	$ 21,313	$ 21,156
Change in Projected Benefit Obligations
Projected benefit obligations, beginning of year	21,156	22,441
Interest cost	927	912	$ 893
Actuarial (gain) loss	299	(1,155)
Actual benefits paid	(1,069)	(1,042)
Projected benefit obligations, end of year	21,313	21,156	22,441
Change in Plan Assets
Fair value of plan assets, beginning of year	15,817	17,094
Actual (loss) return on plan assets	1,895	(299)
Employer contributions	555	64
Actual benefits paid	(1,069)	(1,042)
Fair value of plan assets, end of year	17,198	15,817	$ 17,094
Funded status - under	(4,115)	(5,339)
Amounts Recognized in the Consolidated Balance Sheets consist of:
Noncurrent liabilities	(4,115)	(5,339)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actual loss	8,686	10,295
Deferred tax benefit	(3,223)	(3,850)
After-tax actuarial loss	$ 5,463	$ 6,445
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30
Discount rate	4.10%	4.50%
Rate of compensation increase	0.00%	0.00%
Mortality table	Apr 30, 2017 RP-2014 and Apr 30,2016 RP-2014
Projection scale	Apr 30, 2017 MP-2016 and Apr 30, 2016 MP-2015
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30
Discount rate	4.50%	4.20%
Expected long-term return on plan assets	8.00%	8.25%
Rate of compensation increase	0.00%	0.00%

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Projection scale assumptions used to determine benefit obligations.

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The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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After tax net amount of gain (loss) that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases (decreases) in other comprehensive income as they arise.

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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.

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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.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Expected rate of compensation increases (for pay-related plans).

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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.

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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.

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Amount of contributions made by the employer to defined benefit plans.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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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.

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Relevant mortality and surrender rate assumptions that are an integral part of the methodology used in calculating the reserve for future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and cost of settling insured claims and cost incurred in the claim settlement process.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6482852&loc=d3e14931-158439

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.13(b))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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