RESTRUCTURING ACTIVITIES - Narrative (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	May 26, 2019	May 26, 2019	May 27, 2018	May 28, 2017
Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges expected to be incurred	$ 360.0	$ 360.0
Cash charges	285.0	285.0
Non-cash charges	75.0	75.0
Capital expenditures expected to be incurred	85.0	85.0
Charges incurred or expected to be incurred	260.1	260.1
Charges that have resulted or will result in cash outflows	254.0	163.5
Non-cash charges anticipated to be recognized	6.1	$ 4.7
Period over which costs are expected to be incurred		3 years
Restructuring and related cost, incurred cost		$ 168.2
Conagra Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Cash charges	2.4	2.4
Non-cash charges	1.9	1.9
Charges incurred or expected to be incurred	4.3	4.3
Charges that have resulted or will result in cash outflows		1.4
Non-cash charges anticipated to be recognized		0.8
Restructuring and related cost, incurred cost		2.2
SCAE Plan
Restructuring Cost and Reserve [Line Items]
Cash charges	321.0	321.0
Non-cash charges	150.0	150.0
Charges incurred or expected to be incurred	471.0	471.0
Restructuring and related cost, incurred cost		9.6	$ 38.0	$ 63.6
Cumulative pre-tax expenses recognized	469.9	469.9
Cash charges excluded from cumulative pre-tax expenses	319.9	319.9
Non-cash charges excluded from cumulative pre-tax expenses	150.0	150.0
Cost of goods sold | Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred or expected to be incurred	5.7	5.7
Restructuring and related cost, incurred cost		3.7
Cost of goods sold | SCAE Plan
Restructuring Cost and Reserve [Line Items]
Cumulative pre-tax expenses recognized	103.3	103.3
Selling, general and administrative expense | Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred or expected to be incurred	254.4	254.4
Restructuring and related cost, incurred cost		164.5
Selling, general and administrative expense | SCAE Plan
Restructuring Cost and Reserve [Line Items]
Cumulative pre-tax expenses recognized	364.3	364.3
Pension and postretirement non-service income | SCAE Plan
Restructuring Cost and Reserve [Line Items]
Cumulative pre-tax expenses recognized	$ 2.3	$ 2.3