Postretirement Health Care (Schedule of Cost of Retirement Plans) (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in benefit obligation
Benefit obligation at beginning of year	$ 16,872	$ 15,411	$ 15,254
Service cost	450	364	362
Interest cost	721	804	839
Benefits paid	(1,131)	(909)	(1,023)
Actuarial (gains)/loss	1,635	1,202	(21)
Benefit obligation at end of year	18,547	16,872	15,411
Change in plan assets
Fair value at beginning of year	0	0	0
Actual return on assets	0	0	0
Employer contribution	1,131	909	1,023
Transferred out	0	0	0
Fair value at end of year	0	0	0
Funded Status of Plan	(18,547)	(16,872)	(15,411)
Amounts recognized in the Statement of Financial Position consist of:
Current liabilities	994	988	1,032
Noncurrent liabilities	17,554	15,884	14,379
Amounts recognized in Accumulated Other Comprehensive Income (before tax) consist of:
Actuarial (gain)/loss	1,129	(506)	(1,724)
Transition (asset)/obligation	117	624	1,131
Prior service cost	0	0	0
Change in Accumulated Other Comprehensive Income (before tax):
Change in accumulated other comprehensive income (before tax), beginning of period	118	(593)	(81)
Actuarial (gain)/loss	1,635	1,202	(21)
Amortization of actuarial gain or loss	0	17	17
Amortization of transition amount	(507)	(508)	(508)
Amortization of prior service cost	0	0	0
Change in accumulated other comprehensive income (before tax), end of period	$ 1,246	$ 118	$ (593)