Pension and Postretirement Benefits (Tables)

6 Months Ended

Nov. 27, 2011

Pension and Postretirement Benefits [Abstract]

Components of pension benefit and other postretirement benefit costs

		(44.9)			(44.9)			(44.9)			(44.9)
	Pension Benefits
	Thirteen weeks ended						Twenty-six weeks ended
	November 27, 2011			November 28, 2010			November 27, 2011			November 28, 2010
Service cost	$	17.1		$	14.9		$	34.2		$	29.8
Interest cost		37.2			36.9			74.4			73.8
Expected return on plan assets		(44.9	)		(43.3	)		(89.8	)		(86.6	)
Amortization of prior service cost		0.7			0.8			1.5			1.6
Curtailment loss		—			—			—			1.3
Recognized net actuarial loss		9.7			4.1			19.3			8.2
Benefit cost — Company plans		19.8			13.4			39.6			28.1
Pension benefit cost — multi-employer plans		2.8			2.6			4.9			5.1
Total benefit cost	$	22.6		$	16.0		$	44.5		$	33.2

		(44.9)			(44.9)			(44.9)			(44.9)
	Postretirement Benefits
	Thirteen weeks ended						Twenty-six weeks ended
	November 27, 2011			November 28, 2010			November 27, 2011			November 28, 2010
Service cost	$	0.1		$	0.2		$	0.3		$	0.3
Interest cost		3.2			4.0			6.9			8.1
Expected return on plan assets		—			—			—			(0.1	)
Amortization of prior service cost		(3.6	)		(2.3	)		(5.8	)		(4.7	)
Recognized net actuarial loss		2.0			1.1			3.5			2.3
Total cost	$	1.7		$	3.0		$	4.9		$	5.9