PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 28, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans 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 28, 2016			February 22, 2015			February 28, 2016			February 22, 2015
Service cost	$	23.5		$	22.1		$	71.1		$	66.4
Interest cost	40.0			40.4			122.0			121.1
Expected return on plan assets	(65.1		)	(67.0		)	(198.8		)	(201.0		)
Amortization of prior service cost	0.7			0.9			2.1			2.7
Special termination benefits	25.6			—			25.6			6.9
Benefit cost — Company plans	24.7			(3.6		)	22.0			(3.9		)
Pension benefit cost — multi-employer plans	32.4			2.8			38.8			9.5
Total benefit cost	$	57.1		$	(0.8	)	$	60.8		$	5.6

	Postretirement Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 28, 2016			February 22, 2015			February 28, 2016			February 22, 2015
Service cost	$	0.1		$	0.1		$	0.3		$	0.4
Interest cost	1.9			2.5			5.8			7.5
Amortization of prior service benefit	(2.0		)	(2.0		)	(6.0		)	(5.9		)
Recognized net actuarial loss	—			0.9			—			2.6
Total cost	$	—		$	1.5		$	0.1		$	4.6