PENSION AND POSTRETIREMENT HEALTH CARE BENEFITS - Additional Information (Detail) (USD $) In Millions	3 Months Ended
	Aug. 31, 2011	May 31, 2011
United States Postretirement Benefit Plans of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to retirement plans	$ 1.0	$ 5.2
Total expected contribution to retirement plans	6.2
Foreign Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to retirement plans		$ 8.0