Pensions and Other Postretirement Benefits (Tables)

3 Months Ended

Jul. 29, 2012

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

	First Quarter Ended
	July 29, 2012			July 27, 2011			July 29, 2012			July 27, 2011
	Pension Benefits						Other Retiree Benefits
	(In thousands)
Service cost	$	7,835		$	8,611		$	1,614		$	1,508
Interest cost	32,882			35,547			2,473			2,887
Expected return on plan assets	(62,340		)	(59,781		)	—			—
Amortization of prior service cost/(credit)	632			498			(1,545		)	(1,530		)
Amortization of unrecognized loss	18,904			21,229			451			273
Settlements	1,014			—			—			—
Net periodic benefit (credit)/cost	$	(1,073	)	$	6,104		$	2,993		$	3,138