RESTRUCTURING ACTIVITIES - Schedule of Liabilities Recorded for the Restructuring Plan (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 27, 2018
Restructuring Cost and Reserve
Costs Incurred and Charged to Expense		$ 48.2
Pinnacle Integration Restructuring Plan
Restructuring Cost and Reserve
Beginning balance	$ 97.5
Costs Incurred and Charged to Expense	53.2
Costs Paid or Otherwise Settled	(116.9)
Changes in Estimates	(2.2)
Ending balance	31.6
Pinnacle Integration Restructuring Plan | Severance and related costs
Restructuring Cost and Reserve
Beginning balance	76.9
Costs Incurred and Charged to Expense	11.0
Costs Paid or Otherwise Settled	(62.1)
Changes in Estimates	(2.2)
Ending balance	23.6
Pinnacle Integration Restructuring Plan | Contract/lease termination
Restructuring Cost and Reserve
Beginning balance	1.0
Costs Incurred and Charged to Expense	4.6
Costs Paid or Otherwise Settled	(5.1)
Ending balance	0.5
Pinnacle Integration Restructuring Plan | Consulting/professional fees
Restructuring Cost and Reserve
Beginning balance	18.4
Costs Incurred and Charged to Expense	30.0
Costs Paid or Otherwise Settled	(40.9)
Ending balance	7.5
Pinnacle Integration Restructuring Plan | Other costs
Restructuring Cost and Reserve
Beginning balance	1.2
Costs Incurred and Charged to Expense	7.6
Costs Paid or Otherwise Settled	(8.8)
Conagra Restructuring Plan
Restructuring Cost and Reserve
Beginning balance	1.2
Costs Incurred and Charged to Expense	11.3
Costs Paid or Otherwise Settled	(5.5)
Changes in Estimates	(0.5)
Ending balance	6.5
Conagra Restructuring Plan | Severance and related costs
Restructuring Cost and Reserve
Beginning balance	1.2
Costs Incurred and Charged to Expense	7.5
Costs Paid or Otherwise Settled	(1.7)
Changes in Estimates	(0.5)
Ending balance	6.5
Conagra Restructuring Plan | Contract/lease termination
Restructuring Cost and Reserve
Costs Incurred and Charged to Expense	0.1
Costs Paid or Otherwise Settled	(0.1)
Conagra Restructuring Plan | Other costs
Restructuring Cost and Reserve
Costs Incurred and Charged to Expense	3.7
Costs Paid or Otherwise Settled	$ (3.7)