Employee Benefit Plans - Changes in Plans and AOCI Impacts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Pension benefits | U.S. Pension
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	$ 31,935	$ 31,310
Acquisitions	0	0
Service cost	685	723	$ 842
Interest cost	1,231	1,273	1,229
Actuarial loss	2,626	575
Benefits paid	(1,720)	(1,946)
Settlement payment	0	0
Currency translation	0	0
Projected benefit obligation at end of year	34,757	31,935	31,310
Change in Plan Assets:
Fair value of plan assets at beginning of year	28,985	27,776
Actual return on plan assets	3,409	2,075
Employer contributions	1,080	1,080
Benefits paid	(1,720)	(1,946)
Settlement payment	0	0
Currency translation	0	0
Fair value of plan assets at end of year	31,754	28,985	27,776
Unfunded Status	(3,003)	(2,950)
Accumulated Benefit Obligation at End of Year	30,311	27,573
Current liability	0	0
Non-current liability	(3,003)	(2,950)
Unrecognized net actuarial loss	(7,485)	(7,383)
Unrecognized prior service cost	0	(53)
Total	(7,485)	(7,436)
Current year net actuarial (loss) gain	(544)	213
Amortization of prior service cost	53	55
Amortization of net actuarial loss	442	498
Settlement loss	0	0
Currency translation	0	0
Total	(49)	766
Pension benefits | Non-U.S. Pension
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	3,341	3,041
Acquisitions	241	380
Service cost	148	102	105
Interest cost	114	107	102
Actuarial loss	270	58
Benefits paid	(265)	(63)
Settlement payment	0	0
Currency translation	421	(284)
Projected benefit obligation at end of year	4,270	3,341	3,041
Change in Plan Assets:
Fair value of plan assets at beginning of year	426	396
Actual return on plan assets	23	6
Employer contributions	355	159
Benefits paid	(265)	(63)
Settlement payment	0	0
Currency translation	18	(72)
Fair value of plan assets at end of year	557	426	396
Unfunded Status	(3,713)	(2,915)
Accumulated Benefit Obligation at End of Year	3,047	2,549
Current liability	(205)	(194)
Non-current liability	(3,508)	(2,721)
Unrecognized net actuarial loss	(1,085)	(784)
Unrecognized prior service cost	(52)	(42)
Total	(1,137)	(826)
Current year net actuarial (loss) gain	(277)	(75)
Amortization of prior service cost	6	4
Amortization of net actuarial loss	38	39
Settlement loss	0	0
Currency translation	(78)	85
Total	(311)	53
Other Post-Retirement
Change in Projected Benefit Obligation:
Projected benefit obligation at beginning of year	3,894	3,539
Acquisitions	0	0
Service cost	175	130	117
Interest cost	170	156	147
Actuarial loss	635	686
Benefits paid	(175)	(180)
Settlement payment	0	(415)
Currency translation	5	(22)
Projected benefit obligation at end of year	4,704	3,894	3,539
Change in Plan Assets:
Fair value of plan assets at beginning of year	28	26
Actual return on plan assets	1	1
Employer contributions	179	601
Benefits paid	(175)	(180)
Settlement payment	0	(415)
Currency translation	2	(5)
Fair value of plan assets at end of year	35	28	$ 26
Unfunded Status	(4,669)	(3,866)
Accumulated Benefit Obligation at End of Year	0	0
Current liability	(173)	(183)
Non-current liability	(4,496)	(3,683)
Unrecognized net actuarial loss	(1,424)	(872)
Unrecognized prior service cost	(439)	(525)
Total	(1,863)	(1,397)
Current year net actuarial (loss) gain	(634)	(685)
Amortization of prior service cost	88	88
Amortization of net actuarial loss	83	50
Settlement loss	0	114
Currency translation	(3)	(29)
Total	$ (466)	$ (462)