Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 plan	Jan. 01, 2011	Jan. 02, 2010	Jan. 03, 2009
Employee Benefit Plans [Line Items]
Equity Securities	59.70%	59.80%
Debt Securities	40.30%	40.20%
Period of Return Of Double and Single Digit Returns	10 years
Expected long-term rate of return on assets	7.85%	7.85%	8.10%
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	$ 2,300,000
Number Of Multiemployer Plans, Withdrawal Obligation Could Be Material	2
Multiemployer Plan, Period Contributions	3,100,000	2,900,000	2,800,000
Number of Multiemployer Plans, Certified Red Zone	5
Number of Multiemployer Plans, Certified Yellow Zone	1
Multiemployer Plan, Withdrawal Obligation	1,000,000	1,200,000		3,200,000
Minimum [Member]
Employee Benefit Plans [Line Items]
Investment Objectives Achievement Period	5 years
Maximum [Member]
Employee Benefit Plans [Line Items]
Investment Objectives Achievement Period	7 years
Multiemployer Plan, Contributions To Individual Plan, Percent	5.00%
Hourly 401K Savings Plan [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent	100.00%
Defined Contribution Plan, Employer Matching Contribution Per Pay Period, First Amount Of Participants Deferrals	10
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Amount	520
Defined Contribution Plan, Employer Contribution Amount	700,000	700,000	700,000
Hourly 401K Savings Plan [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Contributions by Plan Participants	520
Salaried 401(k) Savings Plan [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Employer Contribution Amount	1,500,000	1,500,000	1,500,000
Salaried 401(k) Savings Plan [Member] | Minimum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	2.00%
Salaried 401(k) Savings Plan [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	5.00%
Griffins Defined Contribution Plans [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Employer Contribution Amount	500,000
Restructuring of Retirement Benefit Program [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Pay Period Maximum Contribution Per Employee, Percent	6.00%
Restructuring of Retirement Benefit Program [Member] | Hourly 401K Savings Plan [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent	25.00%
Defined Contribution Plan, Pay Period Maximum Contribution Per Employee, Percent	6.00%
Restructuring of Retirement Benefit Program [Member] | Hourly 401K Savings Plan [Member] | Minimum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	2.00%
Restructuring of Retirement Benefit Program [Member] | Hourly 401K Savings Plan [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	5.00%
Restructuring of Retirement Benefit Program [Member] | Salaried 401(k) Savings Plan [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent	25.00%
Restructuring of Retirement Benefit Program [Member] | Salaried 401(k) Savings Plan [Member] | Minimum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	3.00%
Restructuring of Retirement Benefit Program [Member] | Salaried 401(k) Savings Plan [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	6.00%
Small Companies [Member] | Minimum [Member]
Employee Benefit Plans [Line Items]
Capitalization, Long-term Debt and Equity	300,000,000
Small Companies [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Capitalization, Long-term Debt and Equity	$ 2,000,000,000
Geographic Concentration Risk [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Concentration Risk, Percentage	5.00%
Fixed Income Investments [Member] | Maximum [Member]
Employee Benefit Plans [Line Items]
Average Maturity Of Investment	10 years
Equity Securities, International [Member] | Emerging Market [Member]
Employee Benefit Plans [Line Items]
Concentration Risk, Percentage	10.00%
Defined Benefit Plans Assets, Total [Member] | Equity Securities, Domestic [Member]
Employee Benefit Plans [Line Items]
Concentration Risk, Percentage	1.50%
Mutual Funds [Member]
Employee Benefit Plans [Line Items]
Defined Benefit Plan, Actual Plan Asset Allocations	100.00%