Employee Benefit Plans (Details) (USD $)	1 Months Ended	12 Months Ended
	Jul. 31, 2005	Dec. 31, 2011		Jan. 01, 2011		Jan. 02, 2010
Change in projected benefit obligation:
Projected benefit obligation at beginning of period		$ 111,376,000		$ 103,159,000
Service cost		1,178,000		1,056,000		984,000
Interest cost		6,052,000		5,959,000		5,767,000
Actuarial loss		18,028,000		4,996,000
Benefits paid		(4,336,000)		(3,794,000)
Effect of curtailment		(8,911,000)		0
Other		166,000		0
Projected benefit obligation at end of period		123,553,000		111,376,000		103,159,000
Change in plan assets:
Fair value of plan assets at beginning of period		93,308,000		84,099,000
Actual return on plan assets		(3,274,000)		11,974,000
Employer contribution		10,537,000		1,029,000
Benefits paid		(4,336,000)		(3,794,000)
Fair value of plan assets at end of period		96,235,000		93,308,000		84,099,000
Funded status		(27,318,000)		(18,068,000)
Amounts recognized in the consolidated balance sheets consist of:
Non-current liability		(27,318,000)		(18,068,000)
Net amount recognized		(27,318,000)		(18,068,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss		48,702,000		32,146,000
Prior service cost		277,000		264,000
Net amount recognized		48,979,000	[1]	32,410,000	[1]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Tax		18,600,000		12,200,000
Accumulated benefit obligation		123,553,000		103,946,000
Net pension cost includes the following components:
Service cost		1,178,000		1,056,000		984,000
Interest cost		6,052,000		5,959,000		5,767,000
Expected return on plan assets		(6,888,000)		(6,389,000)		(4,811,000)
Net amortization and deferral		2,814,000		3,242,000		4,321,000
Curtailment		63,000		0		0
Net pension cost		3,219,000		3,868,000		6,261,000
Amounts recognized in accumulated other comprehensive income (loss):
Reclassification adjustments		1,668,000		1,917,000
Actuarial (loss)/gain recognized during the period		(11,806,000)		361,000
Reclassification adjustments		55,000		68,000
Prior service cost arising during the period		(63,000)		0
Amounts recognized in accumulated other comprehensive income (loss)		(10,146,000)		2,346,000
Estimated amount that will be amortized from accumulated other comprehensive loss into net periodic pension cost in fiscal 2012:
Net actuarial loss		4,757,000
Prior service cost		89,000
Total		4,846,000
Weighted average assumptions used to determine benefit obligations:
Discount rate		4.50%		5.55%		5.90%
Rate of compensation increase		0.00%		4.16%		4.08%
Weighted average assumptions used to determine net periodic benefit cost for the employee benefit pension plans:
Discount rate		5.55%		5.90%		6.10%
Rate of increase in future compensation levels		4.16%		4.08%		4.08%
Expected long-term rate of return on assets		7.85%		7.85%		8.10%
Company's pension plan weighted-average asset allocations:
Equity Securities		59.70%		59.80%
Debt Securities		40.30%		40.20%
Other		0.00%		0.00%
Total		100.00%		100.00%
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2012		4,860,000
2013		4,950,000
2014		5,380,000
2015		5,690,000
2016		5,880,000
Years 2017 – 2021		34,190,000
Multiemployer Plans [Abstract]
Multiemployer Plan, Period Contributions		3,100,000		2,900,000		2,800,000
Fixed Income, Long Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		33,872,000		32,734,000
Fixed Income, Short Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		4,918,000		4,741,000
Fixed Income Investments [Member]
Target asset allocation ranges:
Defined Benefit Plan, Target Allocation Percentage of Assets, Other, Range Minimum		35.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Other, Range Maximum		45.00%
Equity Securities, Domestic [Member]
Change in plan assets:
Fair value of plan assets at beginning of period		45,465,000
Fair value of plan assets at end of period		47,122,000
Target asset allocation ranges:
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Minimum		45.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum		55.00%
Equity Securities, International [Member]
Change in plan assets:
Fair value of plan assets at beginning of period		10,368,000
Fair value of plan assets at end of period		10,323,000
Target asset allocation ranges:
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Minimum		7.00%
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum		13.00%
Fair Value, Inputs, Level 1 [Member]
Change in plan assets:
Fair value of plan assets at end of period		95,778,000		92,865,000
Fair Value, Inputs, Level 1 [Member] | Fixed Income, Long Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		33,872,000		32,734,000
Fair Value, Inputs, Level 1 [Member] | Fixed Income, Short Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		4,461,000		4,298,000
Fair Value, Inputs, Level 1 [Member] | Equity Securities, Domestic [Member]
Change in plan assets:
Fair value of plan assets at end of period		47,122,000		45,465,000
Fair Value, Inputs, Level 1 [Member] | Equity Securities, International [Member]
Change in plan assets:
Fair value of plan assets at end of period		10,323,000		10,368,000
Fair Value, Inputs, Level 2 [Member]
Change in plan assets:
Fair value of plan assets at end of period		457,000		443,000
Fair Value, Inputs, Level 2 [Member] | Fixed Income, Long Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 2 [Member] | Fixed Income, Short Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		457,000		443,000
Fair Value, Inputs, Level 2 [Member] | Equity Securities, Domestic [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, International [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 3 [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 3 [Member] | Fixed Income, Long Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 3 [Member] | Fixed Income, Short Term [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, Domestic [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, International [Member]
Change in plan assets:
Fair value of plan assets at end of period		0		0
Western Conference Of Teamsters Pension Plan [Member]
Multiemployer Plans [Abstract]
Multiemployer Plan, Period Contributions		1,386,000	[2]	1,401,000	[2]	1,324,000	[2]
Central States, Southeast and Southwest Areas Pension Plan [Member]
Multiemployer Plans [Abstract]
Multiemployer Plan, Period Contributions		705,000	[3],[4]	630,000	[3],[4]	602,000	[3],[4]
Multiemployer Plans, IRS Extended Amortization Period	10 years
Other Multiemployer Plans [Member]
Multiemployer Plans [Abstract]
Multiemployer Plan, Period Contributions		$ 1,009,000		$ 869,000		$ 874,000

[1] Amounts do not include deferred taxes of $18.6 million and $12.2 million at December 31, 2011 and January 1, 2011, respectively.

[2] The Company has several plants that participate in the Western Conference of Teamsters Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through January 1, 2014.

[3] In July 2005 this plan received a 10 year extension from the IRS for amortizing unfunded liabilities.

[4] The Company has several processing plants that participate in the Central States, Southeast and Southwest Areas Pension Plan under collective bargaining agreements that require minimum funding contributions. Certain of these agreements have expired and are being renegotiated with others having expiration dates through August 6, 2014.