Note 2 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) - Conagra Restructuring Plan [Member] $ in Millions	3 Months Ended
	Aug. 27, 2023 USD ($)
Balance	$ 1.9
Costs incurred and charged to expense	5.0
Costs paid or otherwise settled	(1.0)
Changes in estimates	(0.1)
Balance	5.8
Severance And Related Costs [Member]
Balance	1.7
Costs incurred and charged to expense	4.4
Costs paid or otherwise settled	(0.3)
Changes in estimates	(0.1)
Balance	5.7
Consulting And Professional Fees [Member]
Balance	0.2
Costs incurred and charged to expense	0.2
Costs paid or otherwise settled	(0.3)
Changes in estimates	0.0
Balance	0.1
Other Net [Member]
Balance	0.0
Costs incurred and charged to expense	0.4
Costs paid or otherwise settled	(0.4)
Changes in estimates	0.0
Balance	$ 0.0