Pension Benefits - Schedule of Assumptions Used (Details)	12 Months Ended
	Dec. 25, 2011	Dec. 26, 2010	Dec. 27, 2009
Qualified Plans [Member]
Pension Benefits
Discount rate used to calculate net periodic benefit cost	5.60%	6.30%	6.45%
Discount rate used to calculate benefit obligation	5.05%	5.60%
Estimated increase in compensation level used to calculate benefit obligation	3.00%	4.00%
Estimated increase in compensation level use to calculate net periodic benefit cost	4.00%	4.00%	3.50%
Expected long-term rate of return on assets	8.25%	8.75%	8.75%
Non-Qualified Plans [Member]
Pension Benefits
Discount rate used to calculate net periodic benefit cost	5.50%	6.00%	6.60%
Discount rate used to calculate benefit obligation	4.80%	5.45%
Estimated increase in compensation level used to calculate benefit obligation	3.50%	3.50%
Estimated increase in compensation level use to calculate net periodic benefit cost	3.50%	3.50%	3.50%