Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

9 Months Ended

Jan. 27, 2013

Jan. 27, 2013

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

	Third Quarter Ended
	January 27, 2013			January 25, 2012			January 27, 2013			January 25, 2012
	Pension Benefits						Other Retiree Benefits
	(In thousands)
Service cost	$	7,990		$	8,262		$	1,628		$	1,478
Interest cost	33,503			34,273			2,487			2,844
Expected return on plan assets	(63,500		)	(57,665		)	—			—
Amortization of prior service cost/(credit)	639			493			(1,544		)	(1,533		)
Amortization of unrecognized loss	19,151			20,691			451			274
Settlements	3,116			—			—			—
Net periodic benefit expense	$	899		$	6,054		$	3,022		$	3,063

	Nine Months Ended
	January 27, 2013			January 25, 2012			January 27, 2013			January 25, 2012
	Pension Benefits						Other Retiree Benefits
	(In thousands)
Service cost	$	23,793		$	25,318		$	4,875		$	4,475
Interest cost	99,756			104,759			7,452			8,591
Expected return on plan assets	(189,130		)	(176,202		)	—			—
Amortization of prior service cost/(credit)	1,912			1,486			(4,633		)	(4,595		)
Amortization of unrecognized loss	57,235			62,857			1,352			821
Settlements	4,463			—			—			—
Net periodic benefit (income)/expense	$	(1,971	)	$	18,218		$	9,046		$	9,292