RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended		10 Months Ended	12 Months Ended	69 Months Ended
	Nov. 24, 2019	Aug. 25, 2019	Nov. 25, 2018	Nov. 24, 2019	Nov. 25, 2018	Nov. 24, 2019	Nov. 24, 2019	Nov. 24, 2019	Dec. 31, 2018
Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	$ 267.4			$ 267.4		$ 267.4	$ 267.4	$ 267.4	$ 360.0
Cash charges expected to be incurred									255.0
Non-cash charges expected to be incurred									$ 105.0
Cash charges incurred or expected to be incurred	242.3			242.3		242.3	242.3	242.3
Non-cash charges incurred or expected to be incurred	25.1			25.1		25.1	25.1	25.1
Recognized charges	16.2		$ 102.6	43.9	$ 102.6		212.1
Charges that have resulted or will result in cash outflows		$ 11.8		29.1
Non-cash charges		$ 4.4		14.8
Charges that have resulted or will result in cash outflows							190.3
Non-cash charges							21.8
Conagra Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	104.8			104.8		104.8	104.8	104.8
Cash charges incurred or expected to be incurred	31.8			31.8		31.8	31.8	31.8
Non-cash charges incurred or expected to be incurred	73.0			73.0		73.0	73.0	73.0
Recognized charges	19.6			40.7		42.9
Charges that have resulted or will result in cash outflows	(0.2)			4.7
Non-cash charges	19.8			36.0
Charges that have resulted or will result in cash outflows						6.1
Non-cash charges						36.8
SCAE Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	471.0			471.0		471.0	471.0	471.0
Cash charges expected to be incurred	322.2			322.2		322.2	322.2	322.2
Non-cash charges expected to be incurred	148.8			148.8		$ 148.8	$ 148.8	148.8
Recognized charges	$ (0.6)		$ 4.5	$ 0.7	$ 5.1			470.6
Charges that have resulted or will result in cash outflows								321.8
Non-cash charges								148.8
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								365.0
SCAE Plan | Reclassified to Pension and postretirement non-service income
Restructuring Cost and Reserve [Line Items]
Recognized charges								$ 2.3