Employee Benefit Plans (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 30, 2012	Dec. 25, 2011	Dec. 26, 2010	May 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Percentage of contributions by plan participants	6.00%
Percentage of employer cash contribution	50.00%
Employee service period, minimum	1 year
Employee service Period, maximum	5 years
Employer contribution under the plans	$ 1,400,000	$ 1,500,000	$ 1,300,000
Percentage of fair value market Price	85.00%
Employee benefit plan expense	5,121,000	5,668,000	5,228,000
Minimum age of executives for matching contributions to vest immediately	55 years
Maximum age for executives to receive three year vesting period	55 years
Pension plan participation rate	5.00%
Expected contributions under pension plan	5,200,000
Discount rate in benefit obligations	3.53%	4.77%
Expected rate of return on plan assets	5.25%	5.75%	4.00%
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by employee stock purchase plan	1.00%
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of contribution by employee stock purchase plan	25.00%
Employee Stock Purchase Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Additional shares reserved for future issuance				400,000
Share reserved for future issuance				1,050,000
Employee benefit plan expense	400,000	600,000	600,000
Shares authorized under the plan	400,340
Shares issued under the plan	139,135	100,475	102,769
Deferred Compensation Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Vesting period, years	3 years
Executive Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution to deferred compensation plan	25.00%
Matching contribution to deferred stock account	200,000	200,000	400,000
Executive Plan [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of salary contribution by employer	50.00%
Percentage of bonus contribution by employer	100.00%
Director's Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer matching contribution to deferred compensation plan	25.00%
Matching contribution to deferred stock account	$ 24,000	$ 40,000	$ 46,000