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Retirement Benefits - Summary of Plan Assets by Asset Categories (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 15,415	$ 14,007	$ 14,979
Defined benefit plan, Plan asset percentage	100.00%	100.00%
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	7,754	9,417
Defined benefit plan, Plan asset percentage	50.00%	67.00%
Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	4,475	4,547
Defined benefit plan, Plan asset percentage	29.00%	33.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, Plan asset	$ 3,186	$ 43
Defined benefit plan, Plan asset percentage	21.00%

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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