Employee Benefit Plans (Tables)

9 Months Ended

Sep. 25, 2011

Employee Benefit Plans [Abstract]

Schedule Of Assumptions Used To Determine Net Periodic Benefit Cost

	Three months ended						Nine months ended
	September 25, 2011			September 26, 2010			September 25, 2011			September 26, 2010
Pension and SERPA Benefits
Service cost	$	9,274		$	10,345		$	27,819		$	31,131
Interest cost		20,147			19,409			60,441			58,323
Expected return on plan assets		(26,652	)		(24,392	)		(79,959	)		(73,080	)
Amortization of unrecognized:
Prior service cost		746			1,085			2,235			3,351
Net loss		7,550			5,594			22,659			16,878
Curtailment loss		—			15,505			236			15,505
Settlement loss		—			476			—			3,058
Net periodic benefit cost	$	11,065		$	28,022		$	33,431		$	55,166
Postretirement Healthcare Benefits
Service cost	$	1,907		$	2,480		$	5,721		$	7,514
Interest cost		4,911			5,297			14,733			15,891
Expected return on plan assets		(2,346	)		(2,445	)		(7,038	)		(7,335	)
Amortization of unrecognized:
Prior service credit		(969	)		(629	)		(2,907	)		(1,887	)
Net loss		1,798			2,251			5,394			6,753
Curtailment loss		—			12,666			—			11,643
Net periodic benefit cost	$	5,301		$	19,620		$	15,903		$	32,579