SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Property, Plant and Equipment) (Details)	12 Months Ended
	May. 31, 2015
Land improvements | Minimum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	1 year
Land improvements | Maximum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	40 years
Buildings | Minimum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	15 years
Buildings | Maximum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	40 years
Machinery and equipment | Minimum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	3 years
Machinery and equipment | Maximum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	20 years
Furniture, fixtures, office equipment and other | Minimum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	5 years
Furniture, fixtures, office equipment and other | Maximum
Property plant and equipment estimated useful lives of respective classes of assets
Property, plant and equipment, useful life	15 years