Nature of Operations and Basis of Presentation (Policies)	9 Months Ended
Sep. 28, 2020
Accounting Policies [Abstract]
Reclassifications	Reclassifications Certain prior year amounts in the consolidated condensed financial statements have been reclassified due to the sale of the Company’s Mobility business unit. Refer to Note 2, Discontinued Operations, for further information regarding this sale and the resulting prior year reclassifications. During the quarter ended September 28, 2020, the Company’s RF and Specialty Components (RF&S Components) operating segment met the quantitative threshold for separate presentation of a reportable segment. In prior periods, the Company had two reportable segments: PCB and E-M Solutions. The RF&S Components reportable segment was previously aggregated with the PCB reportable segment. As a result, certain prior year amounts and prior quarters within the current year have been reclassified to conform with this new presentation. Further, in 2020, the Company began presenting research and development expenses as a separate line item on the consolidated condensed statements of operations to better align with similar presentation made by peers and to provide additional disclosure that is meaningful for investors. The prior year consolidated condensed statements of operations were adjusted to conform with this new presentation. Research and development expense were previously presented within general and administrative expense on the consolidated condensed statements of operations.
Immaterial Correction of Error	Immaterial Correction of Error During the quarter ended September 28, 2020, the Company paid for certain transaction costs related to the sale of the Mobility business unit totaling $11,043. This should have been recorded as an expense, which would have reduced the gain on sale of Mobility business unit, during the quarter ended June 29, 2020. The Company overstated both the income from discontinued operations, net of income taxes and net income by $11,043, both basic earnings per share from discontinued operations and basic earnings per share of $0.10 and $0.11 in the quarter and two quarters ended June 29, 2020, respectively, and both diluted earnings per share from discontinued operations and diluted earnings per share of $0.10 in the quarter and two quarters ended June 29, 2020. Further, total current liabilities were understated by $11,043 and retained earnings were overstated by $11,043 as of June 29, 2020. Management concluded that this error was not material to the consolidated condensed financial statements for the quarter and two quarters ended June 29, 2020. Prior period amounts have been revised to correct the error.
Recently Adopted and Issued Accounting Standards	Recently Adopted and Issued Accounting Standards Recently Adopted Accounting Standards In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides temporary relief to the GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative rates. This guidance became effective beginning on March 12, 2020 and will remain in effect through December 31, 2022. The guidance on contract modifications can be applied prospectively from any date beginning March 12, 2020 and may also be applied to modifications of existing contracts made earlier in the interim period that included March 12, 2020. The guidance on hedging can be applied to eligible hedging relationships existing at the beginning of the interim period that included March 12, 2020 and to new eligible hedging relationships entered into after the beginning of that interim period. The Company adopted this ASU and it did not have a material impact on its financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which amends the current accounting guidance and requires the measurement of all expected losses based on historical experience, current conditions and reasonable and supportable forecasts. For trade receivables, loans, and other financial instruments, the Company will be required to use a forward-looking expected loss model that reflects losses that are probable rather than the incurred loss model for recognizing credit losses. The standard became effective for interim and annual periods beginning after December 15, 2019. Application of the amendments is through a cumulative-effect adjustment to retained earnings as of the effective date. The Company adopted this ASU as of December 31, 2019 and it did not have a material impact on its financial statements. Recently Issued Accounting Standards Not Yet Adopted In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted. The Company has evaluated the new guidance to determine the impact it may have on its consolidated condensed financial statements and related disclosures and the impact is not expected to be material. In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20)—Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this update change the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. It eliminates requirements for certain disclosures that are no longer considered cost beneficial and requires new disclosures that the FASB considers pertinent. The guidance is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The Company does not anticipate the adoption will have a material impact on its consolidated condensed financial statements and related disclosures.

Nature of Operations and Basis of Presentation (Policies)

9 Months Ended

Sep. 28, 2020

Certain prior year amounts in the consolidated condensed financial statements have been reclassified due to the sale of the Company’s Mobility business unit. Refer to Note 2, Discontinued Operations, for further information regarding this sale and the resulting prior year reclassifications.

During the quarter ended September 28, 2020, the Company’s RF and Specialty Components (RF&S Components) operating segment met the quantitative threshold for separate presentation of a reportable segment. In prior periods, the Company had two reportable segments: PCB and E-M Solutions. The RF&S Components reportable segment was previously aggregated with the PCB reportable segment. As a result, certain prior year amounts and prior quarters within the current year have been reclassified to conform with this new presentation.

Further, in 2020, the Company began presenting research and development expenses as a separate line item on the consolidated condensed statements of operations to better align with similar presentation made by peers and to provide additional disclosure that is meaningful for investors. The prior year consolidated condensed statements of operations were adjusted to conform with this new presentation. Research and development expense were previously presented within general and administrative expense on the consolidated condensed statements of operations.

Immaterial Correction of Error

During the quarter ended September 28, 2020, the Company paid for certain transaction costs related to the sale of the Mobility business unit totaling $11,043. This should have been recorded as an expense, which would have reduced the gain on sale of Mobility business unit, during the quarter ended June 29, 2020. The Company overstated both the income from discontinued operations, net of income taxes and net income by $11,043, both basic earnings per share from discontinued operations and basic earnings per share of $0.10 and $0.11 in the quarter and two quarters ended June 29, 2020, respectively, and both diluted earnings per share from discontinued operations and diluted earnings per share of $0.10 in the quarter and two quarters ended June 29, 2020. Further, total current liabilities were understated by $11,043 and retained earnings were overstated by $11,043 as of June 29, 2020. Management concluded that this error was not material to the consolidated condensed financial statements for the quarter and two quarters ended June 29, 2020. Prior period amounts have been revised to correct the error.

Recently Adopted and Issued Accounting Standards

Recently Adopted Accounting Standards

In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting, which provides temporary relief to the GAAP guidance on contract modifications and hedge accounting to ease the financial reporting burdens of the expected market transition from LIBOR and other interbank offered rates to alternative rates. This guidance became effective beginning on March 12, 2020 and will remain in effect through December 31, 2022. The guidance on contract modifications can be applied prospectively from any date beginning March 12, 2020 and may also be applied to modifications of existing contracts made earlier in the interim period that included March 12, 2020. The guidance on hedging can be applied to eligible hedging relationships existing at the beginning of the interim period that included March 12, 2020 and to new eligible hedging relationships entered into after the beginning of that interim period. The Company adopted this ASU and it did not have a material impact on its financial statements.

In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, which amends the current accounting guidance and requires the measurement of all expected losses based on historical experience, current conditions and reasonable and supportable forecasts. For trade receivables, loans, and other financial instruments, the Company will be required to use a forward-looking expected loss model that reflects losses that are probable rather than the incurred loss model for recognizing credit losses. The standard became effective for interim and annual periods beginning after December 15, 2019. Application of the amendments is through a cumulative-effect adjustment to retained earnings as of the effective date. The Company adopted this ASU as of December 31, 2019 and it did not have a material impact on its financial statements.

Recently Issued Accounting Standards Not Yet Adopted

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. The guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. Early adoption is permitted. The Company has evaluated the new guidance to determine the impact it may have on its consolidated condensed financial statements and related disclosures and the impact is not expected to be material.

In August 2018, the FASB issued ASU 2018-14, Compensation—Retirement Benefits—Defined Benefit Plans—General (Subtopic 715-20)—Disclosure Framework—Changes to the Disclosure Requirements for Defined Benefit Plans. The amendments in this update change the disclosure requirements for employers that sponsor defined benefit pension and/or other postretirement benefit plans. It eliminates requirements for certain disclosures that are no longer considered cost beneficial and requires new disclosures that the FASB considers pertinent. The guidance is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The Company does not anticipate the adoption will have a material impact on its consolidated condensed financial statements and related disclosures.