PENSION AND POSTRETIREMENT BENEFITS (Tables)

6 Months Ended

Nov. 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						Twenty-six weeks ended
	November 23, 2014			November 24, 2013			November 23, 2014			November 24, 2013
Service cost	$	22.2		$	22.2		$	44.3		$	44.5
Interest cost	40.3			37.8			80.7			75.6
Expected return on plan assets	(67.0		)	(63.2		)	(134.0		)	(126.4		)
Amortization of prior service cost	0.9			0.9			1.8			1.8
Special termination benefits	—			—			6.9			—
Benefit cost — Company plans	(3.6		)	(2.3		)	(0.3		)	(4.5		)
Pension benefit cost — multi-employer plans	3.5			3.6			6.7			6.7
Total benefit cost	$	(0.1	)	$	1.3		$	6.4		$	2.2

	Postretirement Benefits
	Thirteen weeks ended						Twenty-six weeks ended
	November 23, 2014			November 24, 2013			November 23, 2014			November 24, 2013
Service cost	$	0.2		$	0.2		$	0.3		$	0.4
Interest cost	2.5			2.4			5.0			4.8
Amortization of prior service benefit	(1.9		)	(1.8		)	(3.9		)	(3.6		)
Recognized net actuarial loss	0.8			1.7			1.7			3.4
Total cost	$	1.6		$	2.5		$	3.1		$	5.0