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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Pension Benefits | U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost   $ 0   $ 0
Interest Cost   284   567
Expected Return on Plan Assets   (248)   (497)
Recognized Net Actuarial Loss   8   16
Amortization of Prior Service Cost   0   0
Net Periodic Benefit Cost   $ 44   $ 86
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage)   4.10%   4.10%
Expected Long-Term Return on Plan Assets (as a percentage)   4.10%   4.10%
Rate of Compensation Increase (as a percentage)   0.00%   0.00%
Pension Benefits | Non-U.S.        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 42 $ 43 $ 86 $ 86
Interest Cost 21 28 44 57
Expected Return on Plan Assets (15) (17) (31) (34)
Recognized Net Actuarial Loss 10 5 21 10
Amortization of Prior Service Cost 1 0 3 0
Net Periodic Benefit Cost $ 59 $ 59 $ 123 $ 119
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 2.06% 2.81% 2.15% 2.81%
Expected Long-Term Return on Plan Assets (as a percentage) 7.21% 9.22% 7.21% 9.22%
Rate of Compensation Increase (as a percentage) 3.14% 2.99% 3.19% 2.99%
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 1 $ 1 $ 3 $ 2
Interest Cost 11 37 20 75
Expected Return on Plan Assets (1) (1) (2) (2)
Recognized Net Actuarial Loss 4 3 8 6
Amortization of Prior Service Cost 0 0 0 0
Net Periodic Benefit Cost $ 15 $ 40 $ 29 $ 81
The weighted average assumptions used to determine net periodic benefit cost are as follows:        
Discount Rate (as a percentage) 3.75% 4.44% 3.84% 4.44%
Expected Long-Term Return on Plan Assets (as a percentage) 7.21% 9.22% 7.21% 9.22%
Rate of Compensation Increase (as a percentage) 5.57% 5.57% 5.57% 5.57%