NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment - Useful Lives (Details)	12 Months Ended
	May 31, 2020
Land improvements | Minimum
Property, Plant and Equipment
Estimated useful lives	1 year
Land improvements | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years
Buildings | Minimum
Property, Plant and Equipment
Estimated useful lives	10 years
Buildings | Maximum
Property, Plant and Equipment
Estimated useful lives	40 years
Machinery and equipment | Minimum
Property, Plant and Equipment
Estimated useful lives	5 years
Machinery and equipment | Maximum
Property, Plant and Equipment
Estimated useful lives	20 years
Furniture, fixtures, office equipment, and other | Minimum
Property, Plant and Equipment
Estimated useful lives	3 years
Furniture, fixtures, office equipment, and other | Maximum
Property, Plant and Equipment
Estimated useful lives	15 years