Note 2 - Restructuring Activities - Restructuring Plan Liabilities Recorded (Details) - Conagra Restructuring Plan [Member] $ in Millions	6 Months Ended
	Nov. 27, 2022 USD ($)
Balance	$ 5.1
Costs incurred and charged to expense	6.5
Costs paid or otherwise settled	(8.7)
Changes in estimates	(0.6)
Balance	2.3
Severance And Related Costs [Member]
Balance	3.2
Costs incurred and charged to expense	1.3
Costs paid or otherwise settled	(1.7)
Changes in estimates	(0.6)
Balance	2.2
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	3.4
Costs paid or otherwise settled	(5.0)
Changes in estimates	0.0
Balance	0.1
Other Net [Member]
Balance	0.2
Costs incurred and charged to expense	1.6
Costs paid or otherwise settled	(1.8)
Changes in estimates	0.0
Balance	$ 0.0