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Summary of Defined Benefit Plan's Assets Measured at Fair Value on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011	May 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	$ 19,746	$ 19,808	$ 14,993
Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	74	349
Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	6,350	5,579
Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	13,322	13,880
Quoted Prices In Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	19,746	19,808
Quoted Prices In Active Markets (Level 1) \| Money Market Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	74	349
Quoted Prices In Active Markets (Level 1) \| Bond Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	6,350	5,579
Quoted Prices In Active Markets (Level 1) \| Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit plan assets fair value	$ 13,322	$ 13,880

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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