DERIVATIVE FINANCIAL INSTRUMENTS - Net derivative gains (losses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 23, 2025	Feb. 25, 2024	Feb. 23, 2025	Feb. 25, 2024
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	$ 8.0	$ (8.3)	$ 12.0	$ 1.2
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of Goods and Services Sold	Cost of Goods and Services Sold	Cost of Goods and Services Sold	Cost of Goods and Services Sold
Grocery & Snacks
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	$ (1.3)	$ (0.6)	$ (5.4)	$ (3.8)
Refrigerated & Frozen
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	(1.1)	(0.2)	(3.4)	(0.4)
International
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	2.9	(0.7)	4.2	(4.3)
Food service
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	(0.2)		(0.7)	0.1
Operating Segments
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	0.3	(1.5)	(5.3)	(8.4)
Corporate, Non-Segment
DERIVATIVE FINANCIAL INSTRUMENTS
Gross derivative gains (losses) incurred	$ 7.7	$ (6.8)	$ 17.3	$ 9.6