Benefit Plans - Benefit Plan Related Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Change in benefit obligation:
Benefit obligation at beginning of year	$ 2,700
Service cost	2,040	$ 2,266	$ 2,037
Interest cost	3,169	3,104	1,887
Benefit obligation at end of year	2,800	2,700
Change in plan assets at fair value:
Fair value of plan assets at beginning of year	70,676
Fair value of plan assets at end of year	78,502	70,676
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent assets	885	811
Current benefit liability	(1,106)	(1,094)
Noncurrent benefit liability	(38,198)	(31,874)
Net liability recognized	(38,419)	(32,157)
Pension Plan
Change in benefit obligation:
Benefit obligation at beginning of year	102,833	67,268
Service cost	2,040	2,266
Interest cost	3,169	3,104
Net actuarial gain/(loss)	11,286	(7,321)
Benefits paid from the trust	(3,323)	(2,479)
Benefits paid directly by the Company	(1,540)	(1,802)
Settlements	(1,924)	(1,291)
Acquisitions	0	48,358
Effect of exchange rate movements	1,735	(6,918)
Plan amendment and other	2,645	1,648
Benefit obligation at end of year	116,921	102,833	67,268
Change in plan assets at fair value:
Fair value of plan assets at beginning of year	70,676	48,123
Actual return on plan assets	8,222	(2,847)
Employer contributions	2,233	2,341
Benefits paid	(3,323)	(2,479)
Settlements	(1,072)	(1,291)
Acquisitions	0	31,954
Effect of exchange rate movements	1,766	(5,125)
Fair value of plan assets at end of year	78,502	70,676	$ 48,123
Net amount unfunded status	$ (38,419)	$ (32,157)