Note 13 - Pension and Postretirement Benefits (Tables)

9 Months Ended

Feb. 25, 2024

Notes Tables

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

	Pension Plans
	Thirteen Weeks Ended						Thirty-Nine Weeks Ended
	February 25, 2024			February 26, 2023			February 25, 2024			February 26, 2023
Service cost	$	1.5		$	1.6		$	4.4		$	4.9
Interest cost		36.1			31.0			109.5			93.0
Expected return on plan assets		(35.3	)		(36.5	)		(106.9	)		(109.4	)
Amortization of prior service cost		0.4			0.4			1.2			1.1
Settlement loss		1.1			—			1.1			—
Pension cost (benefit) — Company plans		3.8			(3.5	)		9.3			(10.4	)
Pension cost (benefit) — multi-employer plans		2.1			2.0			6.9			7.0
Total pension cost (benefit)	$	5.9		$	(1.5	)	$	16.2		$	(3.4	)

	Postretirement Plans
	Thirteen Weeks Ended						Thirty-Nine Weeks Ended
	February 25, 2024			February 26, 2023			February 25, 2024			February 26, 2023
Service cost	$	—		$	—		$	0.1		$	0.1
Interest cost		0.7			0.6			2.0			1.7
Amortization of prior service cost (benefit)		(0.4	)		(0.4	)		(1.2	)		(1.3	)
Recognized net actuarial gain		(1.2	)		(1.1	)		(3.6	)		(3.3	)
Total postretirement cost (benefit)	$	(0.9	)	$	(0.9	)	$	(2.7	)	$	(2.8	)