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Actuarial Assumptions Used for Defined Benefit Plan (Detail)	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
To determine benefit obligation:
Discount rate	4.16%	5.60%	6.00%
To determine net periodic pension cost:
Discount rate	5.60%	6.00%	7.45%
Expected long-term rate of return	8.00%	8.00%	8.00%
Rate of compensation increase

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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