Changes Recognized in Other Comprehensive Income, Postretirement Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
May 31, 2012	May 31, 2011
Postretirement Benefits, U.S. Plans
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Prior service cost
Net loss (gain) arising during the year	754	1,259
Amounts recognized as a component of net periodic benefit cost:
Amortization or curtailment recognition of prior service credit (cost)	86	86
Amortization or settlement recognition of net gain (loss)	58	191
Total recognized in other comprehensive loss (income)	898	1,536
Postretirement Benefits, Non-U.S. Plans
Changes in plan assets and benefit obligations recognized in other comprehensive income:
Prior service cost
Net loss (gain) arising during the year	6,979	(33)
Effect of exchange rates on amounts included in AOCI	(409)	241
Amounts recognized as a component of net periodic benefit cost:
Amortization or settlement recognition of net gain (loss)	(72)	(89)
Total recognized in other comprehensive loss (income)	$ 6,498	$ 119

The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented.

+ References+ Details

The adjustment out of other comprehensive income for prior service costs recognized as a component of net period benefit cost during the period, after tax.

+ References

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+ Details

- Definition

The cost (credit) resulting from a plan amendment that occurred during the period, after tax. The cost has not been recognized in net periodic benefit cost. A plan amendment includes provisions that grant increased benefits based on service rendered in prior periods.

+ References

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+ Details

- Definition

The increase (decrease) in accumulated comprehensive income during the period related to pension and other postretirement benefit plans, after tax. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

+ References+ Details

- Definition

The adjustment out of other comprehensive income for actuarial gains or losses recognized as a component of net periodic benefit cost during the period, after tax.

+ References+ Details