PENSION AND POSTRETIREMENT BENEFITS (Tables)

6 Months Ended

Nov. 24, 2019

Compensation And Retirement Disclosure [Abstract]

Components of Pension Benefit and Other Postretirement Benefit Costs

Components of pension benefit and other postretirement benefit costs are:

	Pension Benefits
	Thirteen weeks ended						Twenty-six weeks ended
	November 24, 2019			November 25, 2018			November 24, 2019			November 25, 2018
Service cost	$	2.8		$	2.8		$	5.6		$	5.5
Interest cost		30.7			32.7			62.0			64.7
Expected return on plan assets		(41.6	)		(43.2	)		(82.7	)		(85.5	)
Amortization of prior service cost		0.6			0.7			1.3			1.4
Curtailment loss		—			—			0.6			—
Benefit cost (benefit) — Company plans		(7.5	)		(7.0	)		(13.2	)		(13.9	)
Pension benefit cost — multi-employer plans		2.0			1.8			3.5			3.5
Total benefit cost (benefit)	$	(5.5	)	$	(5.2	)	$	(9.7	)	$	(10.4	)

	Postretirement Benefits
	Thirteen weeks ended						Twenty-six weeks ended
	November 24, 2019			November 25, 2018			November 24, 2019			November 25, 2018
Service cost	$	0.1		$	—		$	0.1		$	0.1
Interest cost		0.6			1.0			1.3			1.9
Amortization of prior service benefit		(0.5	)		(0.5	)		(1.0	)		(1.0	)
Recognized net actuarial gain		(1.1	)		(0.4	)		(2.3	)		(0.8	)
Curtailment gain		—			—			—			(0.6	)
Total cost (benefit)	$	(0.9	)	$	0.1		$	(1.9	)	$	(0.4	)