PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 26, 2017

Compensation and Retirement Disclosure [Abstract]

Components of Pension Benefit and Other Postretirement Benefit Costs

Components of pension benefit and other postretirement benefit costs are (includes amounts related to discontinued operations):

	Pension Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 26, 2017			February 28, 2016			February 26, 2017			February 28, 2016
Service cost	$	12.2		$	23.5		$	44.8		$	71.1
Interest cost	28.9			40.0			88.8			122.0
Expected return on plan assets	(50.9		)	(65.1		)	(158.6		)	(198.8		)
Amortization of prior service cost	0.7			0.7			2.0			2.1
Settlement charge	13.8			—			13.8			—
Special termination benefits	—			25.6			1.5			25.6
Benefit cost — Company plans	4.7			24.7			(7.7		)	22.0
Pension benefit cost — multi-employer plans	3.9			32.4			9.0			38.8
Total benefit cost	$	8.6		$	57.1		$	1.3		$	60.8

	Postretirement Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 26, 2017			February 28, 2016			February 26, 2017			February 28, 2016
Service cost	$	—		$	0.1		$	0.1		$	0.3
Interest cost	1.1			1.9			3.2			5.8
Amortization of prior service benefit	(1.6		)	(2.0		)	(4.9		)	(6.0		)
Recognized net actuarial loss	0.1			—			0.3			—
Total cost (benefit)	$	(0.4	)	$	—		$	(1.3	)	$	0.1