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Retirement Benefits - Summary of Plan Assets by Asset Categories (Detail) - USD ($) $ in Thousands	Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 17,094	$ 16,288	$ 15,415
Defined benefit plan, Plan asset percentage	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 12,725	$ 11,011
Defined benefit plan, Plan asset percentage	74.00%	68.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 4,273	$ 5,025
Defined benefit plan, Plan asset percentage	25.00%	31.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 96	$ 252
Defined benefit plan, Plan asset percentage	1.00%	1.00%

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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.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 30



-Section 35



-Paragraph 50



-URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930



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)



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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 715



-SubTopic 20



-Section 50



-Paragraph 5



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef



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-Name Accounting Standards Codification



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-Section 50



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