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Employee Benefit Plans (Details 2) (Defined Benefit Pension Plans, USD $) In Thousands, unless otherwise specified	May 31, 2012	May 31, 2011	May 31, 2010
Employee benefit plans
Fair value of plan assets	$ 87,669	$ 94,422	$ 78,892
Quoted prices in active markets (Level 1)
Employee benefit plans
Fair value of plan assets	40,814
Quoted prices in active markets (Level 1) \| Large/medium capitalization equity securities
Employee benefit plans
Fair value of plan assets	17,500
Quoted prices in active markets (Level 1) \| Small capitalization equity securities
Employee benefit plans
Fair value of plan assets	6,379
Quoted prices in active markets (Level 1) \| International equity securities
Employee benefit plans
Fair value of plan assets	5,452
Quoted prices in active markets (Level 1) \| Fixed income
Employee benefit plans
Fair value of plan assets	11,338
Quoted prices in active markets (Level 1) \| Cash and other
Employee benefit plans
Fair value of plan assets	145
Significant other observable inputs (Level 2)
Employee benefit plans
Fair value of plan assets	37,497
Significant other observable inputs (Level 2) \| International equity securities
Employee benefit plans
Fair value of plan assets	7,460
Significant other observable inputs (Level 2) \| Fixed income
Employee benefit plans
Fair value of plan assets	25,952
Significant other observable inputs (Level 2) \| Hedge funds
Employee benefit plans
Fair value of plan assets	3,837
Significant other observable inputs (Level 2) \| Cash and other
Employee benefit plans
Fair value of plan assets	248
Significant other unobservable inputs (Level 3)
Employee benefit plans
Fair value of plan assets	9,358
Significant other unobservable inputs (Level 3) \| Hedge funds
Employee benefit plans
Fair value of plan assets	9,358
Total
Employee benefit plans
Fair value of plan assets	87,669
Total \| Large/medium capitalization equity securities
Employee benefit plans
Fair value of plan assets	17,500
Total \| Small capitalization equity securities
Employee benefit plans
Fair value of plan assets	6,379
Total \| International equity securities
Employee benefit plans
Fair value of plan assets	12,912
Total \| Fixed income
Employee benefit plans
Fair value of plan assets	37,920
Total \| Hedge funds
Employee benefit plans
Fair value of plan assets	13,195
Total \| Cash and other
Employee benefit plans
Fair value of plan assets	$ 393

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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