Note 3 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) - Conagra Restructuring Plan [Member] $ in Millions	6 Months Ended
	Nov. 26, 2023 USD ($)
Balance	$ 1.9
Costs incurred and charged to expense	5.7
Costs paid or otherwise settled	(2.3)
Balance	5.3
Severance And Related Costs [Member]
Balance	1.7
Costs incurred and charged to expense	4.8
Costs paid or otherwise settled	(1.3)
Balance	5.2
Consulting And Professional Fees [Member]
Balance	0.2
Costs incurred and charged to expense	0.2
Costs paid or otherwise settled	(0.3)
Balance	0.1
Other Net [Member]
Balance	0.0
Costs incurred and charged to expense	0.7
Costs paid or otherwise settled	(0.7)
Balance	$ 0.0