Note 3 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) - Conagra Restructuring Plan [Member] $ in Millions	3 Months Ended
	Aug. 28, 2022 USD ($)
Balance	$ 5.1
Costs incurred and charged to expense	4.2
Costs paid or otherwise settled	(3.6)
Changes in estimates	0.0
Balance	5.7
Severance And Related Costs [Member]
Balance	3.2
Costs incurred and charged to expense	0.2
Costs paid or otherwise settled	(0.7)
Changes in estimates	0.0
Balance	2.7
Contract And Lease Termination Expenses [Member]
Balance	0.0
Costs incurred and charged to expense	0.1
Costs paid or otherwise settled	(0.1)
Changes in estimates	0.0
Balance	0.0
Consulting And Professional Fees [Member]
Balance	1.7
Costs incurred and charged to expense	3.0
Costs paid or otherwise settled	(1.7)
Changes in estimates	0.0
Balance	3.0
Other Net [Member]
Balance	0.2
Costs incurred and charged to expense	0.9
Costs paid or otherwise settled	(1.1)
Changes in estimates	0.0
Balance	$ 0.0