Employee Benefit Plans (Multi-Employer Pension Plan) (Details) $ in Thousands		12 Months Ended
		Dec. 26, 2020 USD ($)		Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)	Dec. 30, 2017	Dec. 31, 2016	Dec. 26, 2015	Dec. 27, 2014
Multiemployer Plans [Line Items]
Multiemployer Plan, Pension, Significant, Employees Covered by Collective-Bargaining Arrangement to All Participants, Percentage		15.00%
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List]		Red		Red
Multiemployer Plans, Funding Improvement Plan and Rehabilitation Plan [Fixed List]	[1]	Implemented
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost		$ 272	[2]	$ 335	$ 320
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List]	[1]	Yes
Multiemployer Plans, Collective-Bargaining Arrangement, Expiration Date		Jun. 04, 2022
Multiemployer Plans, Employer Contribution Rate Per Hour		0.47
Multiemployer Plan, Contribution Amount Increase (Decrease)		0.03		0.03	0.02	0.03	0.02	0.03	0.03
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year		$ 277

[1] The collective-bargaining agreement requires the Company to contribute to the plan at the rate of $0.47 per compensated hour for each covered employee. The Company will make additional contributions, as mandated by law, in accordance with the fund's 2010 Rehabilitation Plan which required a surcharge equal to $0.03 per hour (from $0.47 to $0.50) effective June 1, 2014 to May 31, 2015, a surcharge equal to $0.03 per hour (from $0.50 to $0.53) effective June 1, 2015 to May 31, 2016, a surcharge equal to $0.02 per hour (from $0.53 to $0.55) effective June 1, 2016 to May 31, 2017, a surcharge equal to $0.03 per hour (from $0.55 to $0.58) effective June 1, 2017 to May 31, 2018, a surcharge equal to $0.02 per hour (from $0.58 to $0.60) effective June 1, 2018 to May 31, 2019, a surcharge equal to $0.03 per hour (from $0.60 to $0.63) effective June 1, 2019 to May 31, 2020, and a surcharge equal to $0.03 per hour (from $0.63 to $0.66) effective June 1, 2020 to May 31, 2021. Based upon current employment and benefit levels, the Company's contributions to the multi-employer pension plan are expected to be approximately $277 for 2021.

[2] The Company's contributions to the plan do not represent more than 5% of the total contributions to the plan for the most recent plan year available.