Employee Benefit Plans (Tables)

3 Months Ended

Apr. 01, 2012

Employee Benefit Plans [Abstract]

Components Of Net Periodic Benefit Costs

	Three months ended
	April 1, 2012			March 27, 2011
Pension and SERPA Benefits
Service cost	$	8,420		$	9,273
Interest cost		20,816			20,147
Expected return on plan assets		(29,277	)		(26,653	)
Amortization of unrecognized:
Prior service cost		740			745
Net loss		10,969			7,554
Curtailment loss		—			236
Net periodic benefit cost	$	11,668		$	11,302
Postretirement Healthcare Benefits
Service cost	$	1,853		$	1,907
Interest cost		4,578			4,911
Expected return on plan assets		(2,356	)		(2,346	)
Amortization of unrecognized:
Prior service credit		(963	)		(969	)
Net loss		1,855			1,798
Net periodic benefit cost	$	4,967		$	5,301