PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 22, 2015

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 included:

	Pension Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 22, 2015			February 23, 2014			February 22, 2015			February 23, 2014
Service cost	$	22.1		$	22.3		$	66.4		$	66.8
Interest cost	40.4			37.7			121.1			113.3
Expected return on plan assets	(67.0		)	(63.3		)	(201.0		)	(189.7		)
Amortization of prior service cost	0.9			1.1			2.7			2.9
Special termination benefits	—			—			6.9			—
Benefit cost — Company plans	(3.6		)	(2.2		)	(3.9		)	(6.7		)
Pension benefit cost — multi-employer plans	2.8			2.7			9.5			9.4
Total benefit cost	$	(0.8	)	$	0.5		$	5.6		$	2.7

	Postretirement Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 22, 2015			February 23, 2014			February 22, 2015			February 23, 2014
Service cost	$	0.1		$	0.1		$	0.4		$	0.5
Interest cost	2.5			2.5			7.5			7.3
Amortization of prior service benefit	(2.0		)	(1.8		)	(5.9		)	(5.4		)
Recognized net actuarial loss	0.9			1.6			2.6			5.0
Total cost	$	1.5		$	2.4		$	4.6		$	7.4