PENSION AND POSTRETIREMENT BENEFITS (Tables)

9 Months Ended

Feb. 23, 2014

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 23, 2014			February 24, 2013			February 23, 2014			February 24, 2013
Service cost	$	22.3		$	20.6		$	66.8		$	60.9
Interest cost	37.7			37.6			113.3			110.8
Expected return on plan assets	(63.3		)	(54.1		)	(189.7		)	(158.6		)
Amortization of prior service cost	1.1			1.0			2.9			2.6
Curtailment loss	—			—			—			0.8
Benefit cost — Company plans	(2.2		)	5.1			(6.7		)	16.5
Pension benefit cost — multi-employer plans	2.7			1.9			9.4			6.2
Total benefit cost	$	0.5		$	7.0		$	2.7		$	22.7

	Postretirement Benefits
	Thirteen weeks ended						Thirty-nine weeks ended
	February 23, 2014			February 24, 2013			February 23, 2014			February 24, 2013
Service cost	$	0.1		$	0.2		$	0.5		$	0.4
Interest cost	2.5			2.6			7.3			7.6
Amortization of prior service cost	(1.8		)	(2.1		)	(5.4		)	(6.3		)
Recognized net actuarial loss	1.6			1.5			5.0			4.5
Total cost	$	2.4		$	2.2		$	7.4		$	6.2