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Retirement Plans - Estimated Fair Value of Plan Assets (Details) (Riverside Defined Benefit Plans, USD $) In Thousands, unless otherwise specified	May 31, 2013	May 31, 2012
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets at end of year	$ 47,174	$ 40,028
Cash and cash equivalents
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets at end of year	969	882
Mutual funds - equity
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets at end of year	28,713	23,782
Mutual funds - fixed income
Schedule Of Pension Plan Assets By Fair Value [Line Items]
Fair value of plan assets at end of year	$ 17,492	$ 15,364

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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