Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Apr. 01, 2017
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Expected contributions to noncontributory defined benefit plan for the remainder of the year	$ 0
Pension Benefits [Member] \| U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	175	$ 196
Interest Cost	298	314
Expected Return on Plan Assets	(322)	(335)
Recognized Net Actuarial Loss	135	113
Amortization of Prior Service Cost	0	13
Net Periodic Benefit Cost	$ 286	$ 301
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	3.51%	4.03%
Expected Long-Term Return on Plan Assets (as a percentage)	4.50%	5.00%
Rate of Compensation Increase (as a percentage)	3.00%	3.00%
Pension Benefits [Member] \| Non-U.S. [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 36	$ 32
Interest Cost	30	24
Expected Return on Plan Assets	(11)	(8)
Recognized Net Actuarial Loss	16	9
Amortization of Prior Service Cost	2	1
Net Periodic Benefit Cost	$ 73	$ 58
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	3.80%	3.39%
Expected Long-Term Return on Plan Assets (as a percentage)	7.43%	7.72%
Rate of Compensation Increase (as a percentage)	3.69%	3.40%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 53	$ 35
Interest Cost	43	39
Expected Return on Plan Assets	(1)	0
Recognized Net Actuarial Loss	34	13
Amortization of Prior Service Cost	22	21
Net Periodic Benefit Cost	$ 151	$ 108
The weighted average assumptions used to determine net periodic benefit cost are as follows:
Discount Rate (as a percentage)	3.65%	4.13%
Expected Long-Term Return on Plan Assets (as a percentage)	7.43%	7.72%
Rate of Compensation Increase (as a percentage)	3.07%	3.08%

Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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- Definition

Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920

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- Definition

Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment.

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- Definition

Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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