PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 27, 2022

Compensation And Retirement Disclosure [Abstract]

Components of Pension and Postretirement Plan Costs (Benefits)

Components of pension and postretirement plan costs (benefits) are:

	Pension Plans
	Thirteen Weeks Ended						Thirty-Nine Weeks Ended
	February 27, 2022			February 28, 2021			February 27, 2022			February 28, 2021
Service cost	$	2.0		$	2.7		$	6.7		$	9.0
Interest cost		20.9			21.7			62.5			65.1
Expected return on plan assets		(36.4	)		(35.0	)		(109.1	)		(105.0	)
Amortization of prior service cost		0.5			0.5			1.4			1.7
Pension cost (benefit) — Company plans		(13.0	)		(10.1	)		(38.5	)		(29.2	)
Pension cost (benefit) — multi-employer plans		2.0			1.7			6.3			5.7
Total pension cost (benefit)	$	(11.0	)	$	(8.4	)	$	(32.2	)	$	(23.5	)

	Postretirement Plans
	Thirteen Weeks Ended						Thirty-Nine Weeks Ended
	February 27, 2022			February 28, 2021			February 27, 2022			February 28, 2021
Service cost	$	0.1		$	—		$	0.2		$	0.1
Interest cost		0.3			0.4			1.0			1.1
Amortization of prior service cost (benefit)		(0.5	)		(0.5	)		(1.4	)		(1.5	)
Recognized net actuarial gain		(0.9	)		(0.8	)		(2.7	)		(2.6	)
Total postretirement cost (benefit)	$	(1.0	)	$	(0.9	)	$	(2.9	)	$	(2.9	)