Employee Benefit and Pension Plans - Obligations and Funded Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 113,234	$ 104,624
Service cost	896	2,061	$ 466
Interest cost	1,773	2,075	512
Benefits paid	(3,103)	(1,925)
Curtailment	(258)	0
Actuarial loss	6,243	9,134
Employee contributions	986	0
Foreign currency exchange rate changes	10,165	(2,735)
Benefit obligation at end of year	129,936	113,234	104,624
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	69,777	63,064
Actual return on plan assets	447	9,043
Payments	0	(1,397)
Employee contributions	1,305	715
Employer contributions	0	53
Foreign currency exchange rate changes	6,032	(1,701)
Fair value of plan assets at end of year	77,561	69,777	$ 63,064
Net liability recognized	52,375	43,457
Accumulated benefit obligation	$ 128,900	$ 110,800