PENSION AND POSTRETIREMENT BENEFITS (Tables)

6 Months Ended

Nov. 25, 2018

Retirement Benefits [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 25, 2018			November 26, 2017			November 25, 2018			November 26, 2017
Service cost	$	2.8		$	13.2		$	5.5		$	25.9
Interest cost	32.7			27.7			64.7			55.9
Expected return on plan assets	(43.2		)	(54.6		)	(85.5		)	(108.8		)
Amortization of prior service cost	0.7			0.7			1.4			1.4
Recognized net actuarial loss	—			3.4			—			3.4
Curtailment loss	—			0.7			—			0.7
Benefit cost (benefit) — Company plans	(7.0		)	(8.9		)	(13.9		)	(21.5		)
Pension benefit cost — multi-employer plans	1.8			4.2			3.5			5.7
Total benefit cost (benefit)	$	(5.2	)	$	(4.7	)	$	(10.4	)	$	(15.8	)

	Postretirement Benefits
	Thirteen weeks ended						Twenty-six weeks ended
	November 25, 2018			November 26, 2017			November 25, 2018			November 26, 2017
Service cost	$	—		$	—		$	0.1		$	—
Interest cost	1.0			0.9			1.9			1.8
Amortization of prior service benefit	(0.5		)	(0.8		)	(1.0		)	(1.6		)
Recognized net actuarial gain	(0.4		)	—			(0.8		)	—
Curtailment gain	—			—			(0.6		)	—
Total cost (benefit)	$	0.1		$	0.1		$	(0.4	)	$	0.2