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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, 2015	Apr. 30, 2014	Apr. 30, 2013
Compensation and Retirement Disclosure [Abstract]
Accumulated Benefit Obligation, April 30	$ 22,441	$ 19,857
Change in Projected Benefit Obligations
Projected benefit obligations, beginning of year	19,857	20,683
Interest cost	893	857	$ 906
Actuarial (gain) loss	2,688	(737)
Actual benefits paid	(997)	(946)
Projected benefit obligations, end of year	22,441	19,857	20,683
Change in Plan Assets
Fair value of plan assets, beginning of year	16,288	15,415
Actual return on plan assets	1,028	1,519
Employer contributions	775	300
Actual benefits paid	(997)	(946)
Fair value of plan assets, end of year	17,094	16,288	$ 15,415
Funded status - under	(5,347)	(3,569)
Amounts Recognized in the Consolidated Balance Sheets consist of:
Noncurrent assets	0	0
Noncurrent liabilities	(5,347)	(3,569)
Net amount recognized	(5,347)	(3,569)
Amounts recognized in accumulated other comprehensive income (loss) consist of:
Net actual loss	11,011	8,962
Deferred tax benefit	(4,206)	(3,486)
After-tax actuarial loss	$ 6,805	$ 5,476
Weighted-Average Assumptions Used to Determine Benefit Obligations at April 30
Discount rate	4.20%	4.60%
Rate of compensation increase	0.00%	0.00%
Mortality table	Apr 30, 2015 RP-2014	Apr 30, 2014 2013 IRS
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for Years Ended April 30
Discount rate	4.60%	4.25%
Expected long-term return on plan assets	8.25%	8.50%
Rate of compensation increase	0.00%	0.00%

X

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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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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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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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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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Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-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

+ Details

Name:	us-gaap_MortalityMorbidityAndSurrenderRateAssumption
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration