RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		13 Months Ended	15 Months Ended	72 Months Ended
	Feb. 23, 2020	Feb. 24, 2019	Feb. 23, 2020	Feb. 24, 2019	Feb. 23, 2020	Feb. 23, 2020	Feb. 23, 2020	Dec. 31, 2018
Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges approved for incurrence								$ 360.0
Cash charges approved for incurrence								255.0
Non-cash charges approved for incurrence								$ 105.0
Charges expected to be incurred	$ 363.8		$ 363.8		$ 363.8	$ 363.8	$ 363.8
Cash charges incurred or expected to be incurred	257.8		257.8		257.8	257.8	257.8
Non-cash charges incurred or expected to be incurred	106.0		106.0		106.0	106.0	106.0
Recognized charges	19.6	$ 36.9	63.5	$ 139.5		231.7
Charges that have resulted or will result in cash outflows	12.7		41.8
Non-cash charges	6.9		21.7
Charges that have resulted or will result in cash outflows						203.0
Non-cash charges						28.7
Conagra Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges approved for incurrence	129.8		129.8		129.8	129.8	129.8
Cash charges approved for incurrence	36.9		36.9		36.9	36.9	36.9
Non-cash charges approved for incurrence	92.9		92.9		92.9	92.9	92.9
Charges expected to be incurred	126.7		126.7		126.7	126.7	126.7
Cash charges incurred or expected to be incurred	35.2		35.2		35.2	35.2	35.2
Non-cash charges incurred or expected to be incurred	91.5		91.5		91.5	91.5	91.5
Recognized charges	11.9	1.0	52.6	1.0	54.8
Charges that have resulted or will result in cash outflows	2.8		7.5
Non-cash charges	9.1		45.1
Charges that have resulted or will result in cash outflows					8.9
Non-cash charges					45.9
SCAE Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	471.2		471.2		471.2	471.2	471.2
Recognized charges	0.3	$ 3.5	1.0	$ 8.6			470.9
Charges that have resulted or will result in cash outflows							321.7
Non-cash charges							149.2
Cash charges expected to be incurred	322.0		322.0		322.0	322.0	322.0
Non-cash charges expected to be incurred	$ 149.2		$ 149.2		$ 149.2	$ 149.2	149.2
SCAE Plan | Cost of goods sold
Restructuring Cost and Reserve [Line Items]
Recognized charges							103.3
SCAE Plan | Selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Recognized charges							365.3
SCAE Plan | Reclassified to Pension and postretirement non-service income
Restructuring Cost and Reserve [Line Items]
Recognized charges							$ 2.3