Employee Benefit Plans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 26, 2019	Dec. 27, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Description Of Defined Contribution Pension And Other Postretirement Plans	The 401(k) plan provides a matching contribution equal to 100% of the first 3% of compensation and 50% of the next 2% of compensation deposited by an employee into the 401(k) plan
Retirement savings plan expense	$ 1,718,000	$ 2,311,000	$ 2,206,000
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	13,847,000	11,766,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	14,133,000	12,100,000
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	387,000	451,000
Defined Benefit Plan, Accumulated Benefit Obligation	43,548,000	37,474,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), after Tax	$ 286,000	$ 334,000
Common Stock [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Description Of Defined Contribution Pension And Other Postretirement Plans	During fiscal 2020, fiscal 2019 and fiscal 2018, the first 2% of the matching contribution was made with the Company’s common stock.