Note 2 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) - Conagra Restructuring Plan [Member] $ in Millions	9 Months Ended
	Feb. 26, 2023 USD ($)
Balance	$ 5.1
Costs incurred and charged to expense	8.2
Costs paid or otherwise settled	(11.4)
Changes in estimates	(1.0)
Balance	0.9
Severance And Related Costs [Member]
Balance	3.2
Costs incurred and charged to expense	1.3
Costs paid or otherwise settled	(2.8)
Changes in estimates	(1.0)
Balance	0.7
Contract And Lease Termination Expenses [Member]
Balance	0.0
Costs incurred and charged to expense	0.2
Costs paid or otherwise settled	(0.2)
Changes in estimates	0.0
Balance	0.0
Consulting And Professional Fees [Member]
Balance	1.7
Costs incurred and charged to expense	3.9
Costs paid or otherwise settled	(5.4)
Changes in estimates	0.0
Balance	0.2
Other Net [Member]
Balance	0.2
Costs incurred and charged to expense	2.8
Costs paid or otherwise settled	(3.0)
Changes in estimates	0.0
Balance	$ 0.0