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Estimated Fair Value of Plan Assets (Detail) (Riverside Defined Benefit Plans, USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 40,028	$ 39,752
Cash and Cash Equivalents
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	882	715
Equity Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	23,782	24,343
Debt Securities
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 15,364	$ 14,694

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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