RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		37 Months Ended	39 Months Ended
	Feb. 27, 2022	Feb. 28, 2021	Feb. 27, 2022	Feb. 28, 2021	Feb. 27, 2022	Feb. 27, 2022
Pinnacle Integration Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	$ 341.0		$ 341.0		$ 341.0	$ 341.0
Cash charges incurred or expected to be incurred	277.7		277.7		277.7	277.7
Non-cash charges incurred or expected to be incurred	63.3		63.3		63.3	63.3
Recognized charges	0.2	$ 5.4	13.3	$ 24.2		287.0
Charges that have resulted or will result in cash outflows	5.3		17.2			258.1
Non-cash charge (benefit)	5.1		3.9
Non-cash charges						28.9
Conagra Restructuring Plan
Restructuring Cost And Reserve [Line Items]
Charges expected to be incurred	148.4		148.4		148.4	148.4
Cash charges incurred or expected to be incurred	44.6		44.6		44.6	44.6
Non-cash charges incurred or expected to be incurred	103.8		103.8		103.8	103.8
Recognized charges	10.5	$ 10.0	25.6	$ 37.8	138.4
Charges that have resulted or will result in cash outflows	6.8		11.4		35.5
Non-cash charges	3.7		14.2		102.9
Charges approved for incurrence	175.6		175.6		175.6	175.6
Cash charges approved for incurrence	48.8		48.8		48.8	48.8
Non-cash charges approved for incurrence	$ 126.8		$ 126.8		$ 126.8	$ 126.8