PROPERTY, PLANT, AND EQUIPMENT (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016	May 29, 2016
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost	$ 2,243.0		$ 2,243.0		$ 2,034.2
Less accumulated depreciation	(1,057.4)		(1,057.4)		(991.1)
Property, plant, and equipment, net	1,185.6		1,185.6		1,043.1
Financing obligations	76.5		76.5		78.0
Depreciation	25.8	$ 23.1	76.4	$ 69.9
Accounts payable
Property, Plant and Equipment [Line Items]
Purchases of property, plant, and equipment included in accounts payable			31.5		15.5
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost	139.7		139.7		136.5
Buildings, machinery, and equipment
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost	1,858.5		1,858.5		1,776.1
Furniture, fixtures, office equipment and other
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost	62.3		62.3		53.1
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, at cost	182.5		182.5		$ 68.5
Interest capitalized	$ 1.3	$ 0.6	$ 3.2	$ 1.7