Note 3 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) - Conagra Restructuring Plan [Member] $ in Millions	9 Months Ended
	Feb. 25, 2024 USD ($)
Balance	$ 1.9
Costs incurred and charged to expense	6.1
Costs paid or otherwise settled	(3.2)
Changes in estimates	0.1
Balance	4.9
Severance And Related Costs [Member]
Balance	1.7
Costs incurred and charged to expense	4.9
Costs paid or otherwise settled	(1.8)
Changes in estimates	0.1
Balance	4.9
Consulting And Professional Fees [Member]
Balance	0.2
Costs incurred and charged to expense	0.3
Costs paid or otherwise settled	(0.5)
Changes in estimates	0.0
Balance	0.0
Other Net [Member]
Balance	0.0
Costs incurred and charged to expense	0.9
Costs paid or otherwise settled	(0.9)
Changes in estimates	0.0
Balance	$ 0.0