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Activity that Occured for Level Three Assets (Detail) (Significant Unobservable Inputs (Level 3), USD $)
In Thousands, unless otherwise specified

12 Months Ended

May 31, 2013

May 31, 2012

Significant Unobservable Inputs (Level 3)

Defined Benefit Plan Disclosure [Line Items]

Balance at Beginning of Period

$ 43,569

$ 48,716

Actual Return on Plan Assets For Assets Still Held at Reporting Date

1,283

231

Actual Return on Plan Assets For Assets Sold During Year

924

(619)

1,113

^[1]

(3,998)

^[1]

Transfers In/Out of Level 3

(2,731)

(761)

Balance at End of Period

$ 44,158

$ 43,569

[1]	Includes the impact of exchange rate changes during the year.

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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