Nature of Operations and Summary of Significant Accounting Policies (Policies)	3 Months Ended
Apr. 03, 2021
Accounting Policies [Abstract]
Use of Estimates and Critical Accounting Policies	Use of Estimates and Critical Accounting Policies The preparation of financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Although the Company makes every effort to ensure the accuracy of the estimates and assumptions used in the preparation of its condensed consolidated financial statements or in the application of accounting policies, if business conditions were different, or if the Company were to use different estimates and assumptions, it is possible that materially different amounts could be reported in the Company's condensed consolidated financial statements.
Restricted Cash	The Company's restricted cash serves as collateral for certain banker's acceptance drafts issued to vendors and for bank guarantees associated with providing assurance to customers that the Company will fulfill certain customer obligations entered into in the normal course of business. The majority of the bank guarantees will expire over the next twelve months.
Intangible Assets, Net	Intangible assets are recorded at fair value at the date of acquisition. Subsequent impairment charges are reflected as a reduction in the gross balance, as applicable. Definite-lived intangible assets are stated net of accumulated amortization and currency translation in the accompanying condensed consolidated balance sheet. The Company amortizes definite-lived intangible assets over lives that have been determined based on the anticipated cash flow benefits of the intangible asset.
Warranty Obligations	Warranty Obligations The Company's contracts covering the sale of its products include warranty provisions that provide assurance to its customers that the products will comply with agreed-upon specifications during a defined period of time. The Company provides for the estimated cost of product warranties at the time of sale based on historical occurrence rates and repair costs, as well as knowledge of any specific warranty problems that indicate projected warranty costs may vary from historical patterns. The Company negotiates the terms regarding warranty coverage and length of warranty depending on the products and applications. The Company's liability for warranties is included in other current liabilities in the accompanying condensed consolidated balance sheet.
Revenue Recognition	Revenue Recognition Most of the Company’s revenue relates to products and services that require minimal customization and is recognized at a point in time for each performance obligation under the contract when the customer obtains control of the goods or service. The remaining portion of the Company’s revenue is recognized on an over time basis based on an input method that compares the costs incurred to date to the total expected costs required to satisfy the performance obligation. Contracts are accounted for on an over time basis when they include products which have no alternative use and an enforceable right to payment over time. Most of the contracts recognized on an over time basis are for large capital projects. These projects are highly customized for the customer and, as a result, would include a significant cost to rework in the event of cancellation. The Company disaggregates its revenue from contracts with customers by reportable operating segment, product type and geography as this best depicts how its revenue is affected by economic factors. Contract assets represent unbilled revenue associated with revenue recognized on contracts accounted for on an over time basis, which will be billed in future periods based on the contract terms. Contract liabilities consist of customer deposits, advanced billings, and deferred revenue. Deferred revenue is included in other current liabilities in the accompanying condensed consolidated balance sheet. Contract liabilities will be recognized as revenue in future periods once the revenue recognition criteria are met. The majority of the contract liabilities relate to advance payments on contracts accounted for at a point in time. These advance payments will be recognized as revenue when the Company's performance obligations have been satisfied, which typically occurs when the product has shipped and control of the asset has transferred to the customer. The Company recognized revenue of $17,140,000 in the first three months of 2021 and $19,708,000 in the first three months of 2020 that was included in the contract liabilities balance at the beginning of 2021 and 2020. The majority of the Company's contracts for capital equipment have an original expected duration of one year or less. Certain capital contracts require long lead times and could take up to 24 months to complete. For contracts with an original expected duration of over one year, the aggregate amount of the transaction price allocated to the remaining unsatisfied or partially unsatisfied performance obligations as of April 3, 2021 was $16,990,000. The Company will recognize revenue for these performance obligations as they are satisfied, approximately 48% of which is expected to occur within the next twelve months and the remaining 52% within the following twelve months.
Banker's Acceptance Drafts Included in Accounts Receivable	Banker's Acceptance Drafts Included in Accounts ReceivableThe Company's Chinese subsidiaries may receive banker's acceptance drafts from customers as payment for their trade accounts receivable. The drafts are noninterest-bearing obligations of the issuing bank and mature within six months of the origination date. The Company's Chinese subsidiaries may sell the drafts at a discount to a third-party financial institution or transfer the drafts to vendors in settlement of current accounts payable prior to the scheduled maturity date. These drafts, which totaled $10,347,000 at April 3, 2021 and $9,445,000 at January 2, 2021, are included in accounts receivable in the accompanying condensed consolidated balance sheet until the subsidiary sells the drafts to a bank and receives a discounted amount, transfers the banker's acceptance drafts in settlement of current accounts payable prior to maturity, or obtains cash payment on the scheduled maturity date.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes. In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2019-12, which simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and by clarifying and amending existing guidance, including the recognition of franchise tax, the treatment of a step up in the tax basis of goodwill, and the timing for recognition of enacted changes in tax laws or rates in the interim period annual effective tax rate computation. This new guidance is effective in fiscal 2021, and the transition requirements are primarily prospective. The Company adopted this ASU prospectively at the beginning of fiscal 2021 and its adoption did not have an impact on the condensed consolidated financial statements. Recent Accounting Pronouncements Not Yet Adopted Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting. In March 2020, the FASB issued ASU No. 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of reference rates, such as the London Interbank Offered Rate (LIBOR), if certain criteria are met. Generally, contract modifications related to reference rate reform may be considered an event that does not require remeasurement or reassessment of a previous accounting determination at the modification date. The guidance in this ASU is applicable to the Company's existing contracts and hedging relationships that reference LIBOR and may be adopted prospectively through December 31, 2022. The Company is currently evaluating the effects that the adoption of this ASU will have on its consolidated financial statements.
Derivatives	The Company uses forward currency-exchange contracts that generally have maturities of twelve months or less to hedge exposures resulting from fluctuations in currency exchange rates. Such exposures result from assets and liabilities that are denominated in currencies other than the functional currencies. Forward currency-exchange contracts that hedge forecasted accounts receivable or accounts payable are designated as cash flow hedges and unrecognized gains and losses are recorded to AOCI, net of tax. Deferred gains and losses are recognized in the statement of income in the period in which the underlying transaction occurs. The fair values of forward currency-exchange contracts that are designated as fair value hedges and forward currency-exchange contracts that are not designated as hedges are recognized currently in earnings.
Fair Value Measurement	The Company uses the market approach technique to value its financial assets and liabilities, and there were no changes in valuation techniques during the first three months of 2021. Banker's acceptance drafts are carried at face value. which approximates their fair value due to the short-term nature of the negotiable instrument. The fair values of the forward currency-exchange contracts are based on quoted forward foreign exchange rates at the reporting date. The fair value of the 2018 Swap Agreement is based on USD LIBOR yield curves at the reporting date. The forward currency-exchange contracts and the 2018 Swap Agreement are hedges of either recorded assets or liabilities or anticipated transactions and represent the estimated amount the Company would receive or pay upon liquidation of the contracts. Changes in values of the underlying hedged assets and liabilities or anticipated transactions are not reflected in the table above.The carrying value of the Company's revolving credit facility approximates the fair value as the obligation bears variable rates of interest, which adjust frequently, based on prevailing market rates. The fair value of the senior promissory notes is primarily calculated based on quoted market rates plus an applicable margin available to the Company at the respective period ends, which represent Level 2 measurements.

Nature of Operations and Summary of Significant Accounting Policies (Policies)

3 Months Ended

Apr. 03, 2021

Use of Estimates and Critical Accounting Policies

The preparation of financial statements in conformity with U.S. generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expenses during the reporting period. Although the Company makes every effort to ensure the accuracy of the estimates and assumptions used in the preparation of its condensed consolidated financial statements or in the application of accounting policies, if business conditions were different, or if the Company were to use different estimates and assumptions, it is possible that materially different amounts could be reported in the Company's condensed consolidated financial statements.

Restricted Cash

The Company's restricted cash serves as collateral for certain banker's acceptance drafts issued to vendors and for bank guarantees associated with providing assurance to customers that the Company will fulfill certain customer obligations entered into in the normal course of business. The majority of the bank guarantees will expire over the next twelve months.

Intangible Assets, Net

Intangible assets are recorded at fair value at the date of acquisition. Subsequent impairment charges are reflected as a reduction in the gross balance, as applicable. Definite-lived intangible assets are stated net of accumulated amortization and currency translation in the accompanying condensed consolidated balance sheet. The Company amortizes definite-lived intangible assets over lives that have been determined based on the anticipated cash flow benefits of the intangible asset.

Warranty Obligations

The Company's contracts covering the sale of its products include warranty provisions that provide assurance to its customers that the products will comply with agreed-upon specifications during a defined period of time. The Company provides for the estimated cost of product warranties at the time of sale based on historical occurrence rates and repair costs, as well as knowledge of any specific warranty problems that indicate projected warranty costs may vary from historical patterns. The Company negotiates the terms regarding warranty coverage and length of warranty depending on the products and applications.

The Company's liability for warranties is included in other current liabilities in the accompanying condensed consolidated balance sheet.

Revenue Recognition

Most of the Company’s revenue relates to products and services that require minimal customization and is recognized at a point in time for each performance obligation under the contract when the customer obtains control of the goods or service. The remaining portion of the Company’s revenue is recognized on an over time basis based on an input method that compares the costs incurred to date to the total expected costs required to satisfy the performance obligation. Contracts are accounted for on an over time basis when they include products which have no alternative use and an enforceable right to payment over time. Most of the contracts recognized on an over time basis are for large capital projects. These projects are highly customized for the customer and, as a result, would include a significant cost to rework in the event of cancellation.

The Company disaggregates its revenue from contracts with customers by reportable operating segment, product type and geography as this best depicts how its revenue is affected by economic factors.

Contract assets represent unbilled revenue associated with revenue recognized on contracts accounted for on an over time basis, which will be billed in future periods based on the contract terms. Contract liabilities consist of customer deposits, advanced billings, and deferred revenue. Deferred revenue is included in other current liabilities in the accompanying condensed consolidated balance sheet. Contract liabilities will be recognized as revenue in future periods once the revenue recognition criteria are met. The majority of the contract liabilities relate to advance payments on contracts accounted for at a point in time. These advance payments will be recognized as revenue when the Company's performance obligations have been satisfied, which typically occurs when the product has shipped and control of the asset has transferred to the customer.

The Company recognized revenue of $17,140,000 in the first three months of 2021 and $19,708,000 in the first three months of 2020 that was included in the contract liabilities balance at the beginning of 2021 and 2020. The majority of the Company's contracts for capital equipment have an original expected duration of one year or less. Certain capital contracts require long lead times and could take up to 24 months to complete. For contracts with an original expected duration of over one year, the aggregate amount of the transaction price allocated to the remaining unsatisfied or partially unsatisfied performance obligations as of April 3, 2021 was $16,990,000. The Company will recognize revenue for these performance obligations as they are satisfied, approximately 48% of which is expected to occur within the next twelve months and the remaining 52% within the following twelve months.

Banker's Acceptance Drafts Included in Accounts Receivable

Banker's Acceptance Drafts Included in Accounts ReceivableThe Company's Chinese subsidiaries may receive banker's acceptance drafts from customers as payment for their trade accounts receivable. The drafts are noninterest-bearing obligations of the issuing bank and mature within six months of the origination date. The Company's Chinese subsidiaries may sell the drafts at a discount to a third-party financial institution or transfer the drafts to vendors in settlement of current accounts payable prior to the scheduled maturity date. These drafts, which totaled $10,347,000 at April 3, 2021 and $9,445,000 at January 2, 2021, are included in accounts receivable in the accompanying condensed consolidated balance sheet until the subsidiary sells the drafts to a bank and receives a discounted amount, transfers the banker's acceptance drafts in settlement of current accounts payable prior to maturity, or obtains cash payment on the scheduled maturity date.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes. In December 2019, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2019-12, which simplifies the accounting for income taxes by removing certain exceptions to the general principles in Topic 740 and by clarifying and amending existing guidance, including the recognition of franchise tax, the treatment of a step up in the tax basis of goodwill, and the timing for recognition of enacted changes in tax laws or rates in the interim period annual effective tax rate computation. This new guidance is effective in fiscal 2021, and the transition requirements are primarily prospective. The Company adopted this ASU prospectively at the beginning of fiscal 2021 and its adoption did not have an impact on the condensed consolidated financial statements.

Recent Accounting Pronouncements Not Yet Adopted

Reference Rate Reform (Topic 848), Facilitation of the Effects of Reference Rate Reform on Financial Reporting. In March 2020, the FASB issued ASU No. 2020-04, which provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by the discontinuation of reference rates, such as the London Interbank Offered Rate (LIBOR), if certain criteria are met. Generally, contract modifications related to reference rate reform may be considered an event that does not require remeasurement or reassessment of a previous accounting determination at the modification date. The guidance in this ASU is applicable to the Company's existing contracts and hedging relationships that reference LIBOR and may be adopted prospectively through December 31, 2022. The Company is currently evaluating the effects that the adoption of this ASU will have on its consolidated financial statements.

Derivatives

The Company uses forward currency-exchange contracts that generally have maturities of twelve months or less to hedge exposures resulting from fluctuations in currency exchange rates. Such exposures result from assets and liabilities that are denominated in currencies other than the functional currencies. Forward currency-exchange contracts that hedge forecasted accounts receivable or accounts payable are designated as cash flow hedges and unrecognized gains and losses are recorded to AOCI, net of tax. Deferred gains and losses are recognized in the statement of income in the period in which the underlying transaction occurs. The fair values of forward currency-exchange contracts that are designated as fair value hedges and forward currency-exchange contracts that are not designated as hedges are recognized currently in earnings.

Fair Value Measurement

The Company uses the market approach technique to value its financial assets and liabilities, and there were no changes in valuation techniques during the first three months of 2021. Banker's acceptance drafts are carried at face value. which approximates their fair value due to the short-term nature of the negotiable instrument. The fair values of the forward currency-exchange contracts are based on quoted forward foreign exchange rates at the reporting date. The fair value of the 2018 Swap Agreement is based on USD LIBOR yield curves at the reporting date. The forward currency-exchange contracts and the 2018 Swap Agreement are hedges of either recorded assets or liabilities or anticipated transactions and represent the estimated amount the Company would receive or pay upon liquidation of the contracts. Changes in values of the underlying hedged assets and liabilities or anticipated transactions are not reflected in the table above.The carrying value of the Company's revolving credit facility approximates the fair value as the obligation bears variable rates of interest, which adjust frequently, based on prevailing market rates. The fair value of the senior promissory notes is primarily calculated based on quoted market rates plus an applicable margin available to the Company at the respective period ends, which represent Level 2 measurements.