Benefit Plans - Benefit Plan Related Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Change in benefit obligation:
Benefit obligation at beginning of year	$ 67,268	$ 55,606
Service cost	2,266	2,037	$ 1,509
Interest cost	3,104	1,887	1,662
Net actuarial gain	(7,321)	(433)
Benefits paid from the trust	(2,479)	(1,405)
Benefits paid directly by the Company	(1,802)	(1,098)
Settlements	(1,291)	(31)
Acquisitions	48,358	0
Effect of exchange rate movements	(6,918)	5,477
Other	1,648	5,228
Benefit obligation at end of year	102,833	67,268	55,606
Change in plan assets at fair value:
Fair value of plan assets at beginning of year	48,123	42,208
Actual return on plan assets	(2,847)	2,962
Employer contributions	2,341	264
Benefits paid	(2,479)	(1,405)
Settlements	(1,291)	0
Acquisitions	31,954	0
Effect of exchange rate movements	(5,125)	4,094
Fair value of plan assets at end of year	70,676	48,123	$ 42,208
Net amount recognized/(unfunded status)	(32,157)	(19,145)
Amounts recognized in the Consolidated Balance Sheets consist of:
Noncurrent assets	811	78
Current benefit liability	(1,094)	(481)
Noncurrent benefit liability	(31,874)	(18,742)
Net liability recognized	$ (32,157)	$ (19,145)