Note 2 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) $ in Millions	12 Months Ended
	May 29, 2022 USD ($)
Pinnacle Integration Restructuring Plan [Member]
Balance	$ 9.0
Costs incurred and charged to expense	24.1
Costs paid or otherwise settled	(28.1)
Changed in estimates	(0.1)
Balance	4.9
Pinnacle Integration Restructuring Plan [Member] | Severance And Related Costs [Member]
Balance	5.1
Costs incurred and charged to expense	0.3
Costs paid or otherwise settled	(5.6)
Changed in estimates	0.5
Balance	0.3
Pinnacle Integration Restructuring Plan [Member] | Contract And Lease Termination Expenses [Member]
Balance	0.0
Costs incurred and charged to expense	0.0
Changed in estimates	(0.6)
Balance	0.0
Costs paid or otherwise settled	0.6
Pinnacle Integration Restructuring Plan [Member] | Consulting And Professional Fees [Member]
Balance	3.9
Costs incurred and charged to expense	19.3
Costs paid or otherwise settled	(18.6)
Changed in estimates	0.0
Balance	4.6
Pinnacle Integration Restructuring Plan [Member] | Other Net [Member]
Balance	0.0
Costs incurred and charged to expense	4.5
Costs paid or otherwise settled	(4.5)
Changed in estimates	0.0
Balance	0.0
Conagra Restructuring Plan [Member]
Balance	9.7
Costs incurred and charged to expense	17.6
Costs paid or otherwise settled	(20.6)
Changed in estimates	(1.6)
Balance	5.1
Conagra Restructuring Plan [Member] | Severance And Related Costs [Member]
Balance	9.7
Costs incurred and charged to expense	5.0
Costs paid or otherwise settled	(9.9)
Changed in estimates	(1.6)
Balance	3.2
Conagra Restructuring Plan [Member] | Contract And Lease Termination Expenses [Member]
Balance	0.0
Costs incurred and charged to expense	0.4
Costs paid or otherwise settled	(0.4)
Changed in estimates	0.0
Balance	0.0
Conagra Restructuring Plan [Member] | Consulting And Professional Fees [Member]
Balance	0.0
Costs incurred and charged to expense	1.7
Costs paid or otherwise settled	0.0
Changed in estimates	0.0
Balance	1.7
Conagra Restructuring Plan [Member] | Other Net [Member]
Balance	0.0
Costs incurred and charged to expense	10.5
Costs paid or otherwise settled	(10.3)
Changed in estimates	0.0
Balance	$ 0.2