Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Pension Benefits | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service Cost		$ 0
Interest Cost		283
Expected Return on Plan Assets		(249)
Recognized Net Actuarial Loss		8
Amortization of Prior Service Cost		0
Net Periodic Benefit Cost		$ 42
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)		4.10%
Expected Long-Term Return on Plan Assets (as a percentage)		4.10%
Rate of Compensation Increase (as a percentage)		0.00%
Pension Benefits | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 44	$ 43
Interest Cost	23	29
Expected Return on Plan Assets	(16)	(17)
Recognized Net Actuarial Loss	11	5
Amortization of Prior Service Cost	2	0
Net Periodic Benefit Cost	$ 64	$ 60
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	2.25%	2.80%
Expected Long-Term Return on Plan Assets (as a percentage)	7.21%	9.22%
Rate of Compensation Increase (as a percentage)	3.23%	2.98%
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 2	$ 1
Interest Cost	9	38
Expected Return on Plan Assets	(1)	(1)
Recognized Net Actuarial Loss	4	3
Amortization of Prior Service Cost	0	0
Net Periodic Benefit Cost	$ 14	$ 41
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	3.92%	4.44%
Expected Long-Term Return on Plan Assets (as a percentage)	7.21%	9.22%
Rate of Compensation Increase (as a percentage)	5.57%	5.57%