Pensions and Other Postretirement Benefits (Tables)

6 Months Ended

Oct. 28, 2012

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit cost

	Second Quarter Ended
	October 28, 2012			October 26, 2011			October 28, 2012			October 26, 2011
	Pension Benefits						Other Retiree Benefits
	(In thousands)
Service cost	$	7,968		$	8,445		$	1,633		$	1,489
Interest cost	33,371			34,939			2,492			2,860
Expected return on plan assets	(63,290		)	(58,756		)	—			—
Amortization of prior service cost/(credit)	641			495			(1,544		)	(1,532		)
Amortization of unrecognized loss	19,180			20,937			450			274
Settlements	333			—			—			—
Net periodic benefit (income)/expense	$	(1,797	)	$	6,060		$	3,031		$	3,091

	Six Months Ended
	October 28, 2012			October 26, 2011			October 28, 2012			October 26, 2011
	Pension Benefits						Other Retiree Benefits
	(In thousands)
Service cost	$	15,803		$	17,056		$	3,247		$	2,997
Interest cost	66,253			70,486			4,965			5,747
Expected return on plan assets	(125,630		)	(118,537		)	—			—
Amortization of prior service cost/(credit)	1,273			993			(3,089		)	(3,062		)
Amortization of unrecognized loss	38,084			42,166			901			547
Settlements	1,347			—			—			—
Net periodic benefit (income)/expense	$	(2,870	)	$	12,164		$	6,024		$	6,229