Deferred Compensation and Other Benefits - Schedule of Net Periodic Pension Cost (Details) - Deferred Compensation and Other Benefits [Member] - Executive Officer [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 109	$ 82	$ 314	$ 249
Interest cost	90	145	264	438
Expected return on assets	(167)	(152)	(484)	(460)
Amortization of actuarial loss	76	48	224	144
Net periodic pension cost	$ 108	$ 123	$ 318	$ 371