Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2018	Dec. 28, 2017
Change in benefit obligation:
Benefit obligation at beginning of period	$ 37,639	$ 32,523
Service cost	926	765
Interest cost	1,364	1,356
Actuarial (gain) loss	(2,633)	4,244
Benefits paid	(1,656)	(1,249)
Benefit obligation at end of year	35,640	37,639
Amounts recognized in the statement of financial position consist of:
Current accrued benefit liability (included in Other accrued liabilities)	(1,378)	(1,347)
Noncurrent accrued benefit liability (included in Deferred compensation and other)	(34,262)	(36,292)
Total	(35,640)	(37,639)
Amounts recognized in accumulated other comprehensive loss consist of:
Net actuarial loss	9,556	12,874
Prior service credit	(515)	(579)
Total	$ 9,041	$ 12,295