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[Line Items] Unpaid customer rebates Customer Refund Liability, Current Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Construction in progress Construction in Progress, Gross Lam Research Corporation Lam Research Corporation [Member] Lam Research Corporation. Number of operating segments Number of Operating Segments Common shares excluded from calculation of diluted net income (loss) per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restricted Stock Units Restricted Stock Units (RSUs) [Member] Summary of Outstanding Potentially Dilutive Shares were Excluded From the Calculation of Diluted Net Income (Loss) Per Share of Common Stock Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Summary of Details of Goodwill Goodwill [Table Text Block] Entity Central Index Key Entity Central Index Key Accumulated depreciation Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Additional paid-in capital Additional Paid in Capital, Common Stock All Adjustments to Compensation All Adjustments to Compensation [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Accounts Receivable Accounts Receivable [Member] Income Statement [Abstract] Income Statement [Abstract] UCT stockholders’ equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Operating expenses: Operating Expenses [Abstract] Deferred tax assets, net Deferred Income Tax Assets, Net Computer equipment and software Computer Equipment And Software [Member] Computer equipment and software. 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Statement [Line Items] Statement [Line Items] Total assets Total segment assets Assets Unit purchase price of Restricted Stock Units Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Equity Units Acquired Purchase Price Share based compensation arrangement by share based payment award other than options equity units acquired purchase price. Schedule Of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Fair value of benefit plan assets Defined Benefit Plan, Plan Assets, Amount Convertible Notes Convertible notes Convertible Debt [Member] Restricted Stock Unit, Performance Stock Units and Restricted Stock Award Restricted Stock Units Performance Stock Units And Restricted Stock Awards [Member] Restricted stock units, performance stock units and restricted stock awards. 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Retained Earnings Retained Earnings [Member] Operating lease liabilities Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Revolving Credit Facility Revolving Credit Facility [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Others Other Geographical Areas [Member] Other geographical areas. Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock, shares outstanding (in shares) Common stock, shares, beginning balance (in shares) Common stock, shares, ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Payment of debt issuance costs Payments of Debt Issuance Costs Diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Percentage expected target award range, maximum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Total Shareholder Return Amount Total Shareholder Return Amount Employees' taxes paid upon vesting of restricted stock units Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Accrued compensation and related benefits Increase (Decrease) in Employee Related Liabilities Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Finite Lived Intangible Assets [Line Items] Intangible Asset, Finite-Lived [Line Items] Research and development Research and Development Expense Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant and equipment, net Total Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Remaining available commitments Line of Credit Facility, Remaining Borrowing Capacity Cash proceeds from sales of accounts receivables Cash Flows Between Transferor and Transferee, Proceeds from New Transfers Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Debt Instrument, Convertible Terms Of Conversion [Domain] Financial Instruments Financial Instruments [Domain] Factoring arrangement, maximum uncollectable receivables approved to be sold Transfer of Financial Assets Accounted for as Sales, Maximum Uncollectable Receivables Approved To Be Sold Transfer of Financial Assets Accounted for as Sales, Maximum Uncollectable Receivables Approved To Be Sold Total Total Customer [Member] Applied Materials Inc. Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets [Line Items] Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets [Line Items] Repurchase of common stock Stock Repurchased During Period, Value Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Axis] Cap initial strike price (in dollars per share) Debt Instrument, Convertible, Stock Price Trigger Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill and Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive income, attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Gross Carrying Amount, Finite and Indefinite-Lived Intangible Asset, Excluding Goodwill, before Accumulated Amortization Revenue Recognition Revenue from Contract with Customer [Text Block] Amortization of intangible assets Amortization Of Finite Lived Intangibles Amortization of finite-lived intangibles. Debt instrument, covenant, consolidated secured net leverage ratio, after material acquisition, maximum Debt Instrument, Covenant, Consolidated Secured Net Leverage Ratio, After Material Acquisition, Maximum Debt Instrument, Covenant, Consolidated Secured Net Leverage Ratio, After Material Acquisition, Maximum UCT Tradename Uct Trade Name [Member] UCT Trade Name [Member] Inventories Increase (Decrease) in Inventories Schedule Of Segment Reporting Information By Segment Table Segment Reporting [Table] Title of Individual Title and Position [Axis] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Summary of Assets or Liabilities Measured at Fair Value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Change in the fair value of financial instruments Derivative, Gain (Loss) on Derivative, Net Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Income (loss) from operations Total segment operating profit (loss) Operating Income (Loss) Services Service [Member] Current Fiscal Year End Date Current Fiscal Year End Date Award performance period Share Based Compensation Arrangement By Share Based Payment Award Performance Objective Period Share Based Compensation Arrangement By Share Based Payment Award Performance Objective Period. Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Long-lived assets Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Dividend payments to a joint venture shareholder Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock, shares issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Finished goods Inventory, Finished Goods, Gross Unvested restricted stock units and restricted stock awards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Applied Materials, Inc. Applied Materials Inc [Member] Applied Materials Inc. Common shares held in treasury (in shares) Treasury stock, shares, beginning balance (in shares) Treasury stock, shares, ending balance (in shares) Treasury Stock, Common, Shares Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service Product and Service [Domain] Income taxes paid, net of income tax refunds Income Tax Paid, after Refund Received Entity Interactive Data Current Entity Interactive Data Current Less: Net income attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Property, plant and equipment purchased included in accounts payable and other liabilities Noncash or Part Noncash Acquisition, Fixed Assets Acquired Deferred tax liabilities Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Czech Republic CZECHIA Comprehensive income (loss) attributable to UCT Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Useful Life (In years) Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Property, Plant and Equipment Line Items Property, Plant, and Equipment [Line Items] Thereafter Finite Lived Intangible Assets Amortization Expense After Year Four Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other non-current assets Other Assets, Noncurrent Document Type Document Type Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Debt redemption price as percentage of principal amount Debt Instrument, Redemption Price, Percentage Schedule Of Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Local Phone Number Local Phone Number Total depreciation and amortization Depreciation, Depletion and Amortization, Adjusted Depreciation, Depletion and Amortization, Adjusted Work in process Inventory, Work in Process, Gross Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Clarence Granger [Member] Clarence Granger Income (loss) before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (See Note 8) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Equipment and leasehold improvements, gross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] 2030 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Four Other non-current assets: Other Assets [Abstract] Machinery and equipment Machinery and Equipment [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] China CHINA Shares vesting period, years Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Goodwill [Roll Forward] Goodwill [Roll Forward] Furniture and fixtures Furniture and Fixtures [Member] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class Intangible Asset, Finite-Lived, Class [Domain] Austria AUSTRIA Tradename Trade Names [Member] Inventories Total Inventory, Net Award Type Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Recipes Recipes [Member] Recipes. Repurchase of shares (in shares) Treasury Stock, Shares, Acquired 2027 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year One Closing price of common stock (in dollars per share) Share Price PEO Name PEO Name Threshold percentage of stock price trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Geographical Geographical [Axis] Leasehold improvements Leasehold Improvements [Member] Revolver Amended Credit Agreement Credit Agreement [Member] Credit Agreement Long-Lived Asset, Class Long-Lived Asset, Class [Axis] Voluntary prepayment Repayments of Secured Debt Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Repurchase of shares Treasury Stock, Value, Acquired, Cost Method Cash and cash equivalents at beginning of period Cash and cash equivalents at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Expenditures for segment property, plant and equipment Expenditures For Segment Assets [Abstract] Expenditures For Segment Assets Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Israel ISRAEL Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument Debt Instrument [Axis] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense 2027 Defined Benefit Plan, Expected Future Benefit Payment, Year One 2028 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Two Employee common stock fair market value rate Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Percentage of undrawn and unexpired amount of letter of credit as fronting fee Percentage Of Undrawn And Unexpired Amount Of Letter Of Credit As Fronting Fee Percentage of undrawn and unexpired amount of letter of credit as fronting fee. Employee stock purchase plan Employee Stock [Member] Customer Customer [Domain] Summary of Inventories Schedule of Inventory, Current [Table Text Block] Leases Lessee, Operating Leases [Text Block] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Intellectual property/know-how Intellectual Property [Member] Raw materials Inventory, Raw Materials, Gross One Customer One Customer [Member] One Customer Repurchase of common stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt Long-Term Debt, Excluding Current Maturities Total cost revenues Cost of Revenue Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net of allowance for credit losses of $1.0 and $0.9 at June 26, 2026 and December 26, 2025, respectively Accounts Receivable, after Allowance for Credit Loss, Current Retained earnings Retained Earnings (Accumulated Deficit) Product and Service Product and Service [Axis] Number of trading days Debt Instrument, Convertible, Threshold Trading Days Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Maximum contribution from salary, percent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Number of shares of common stock issued under ESPP (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period Organization and Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Cover [Abstract] Cover [Abstract] Noncontrolling Interest [Abstract] Noncontrolling Interest [Abstract] Amortization Expense Intangible Asset, Finite-Lived, after Accumulated Amortization, Estimated Amortization Expense, Fiscal Year Maturity [Abstract] Concentration percentage Total Concentration Risk, Percentage Concentration Risk Benchmark Concentration Risk Benchmark [Axis] Aggregate pension benefit obligations Liability, Defined Benefit Pension Plan Equity Awards Adjustments Equity Awards Adjustments [Member] Schedule of Net Carrying Amount of Convertible Notes Convertible Debt [Table Text Block] Unfunded balance of benefit plan Defined Benefit Plan, Funded (Unfunded) Status of Plan Total liabilities and equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Schedule Of Revenues From External Customers And Long Lived Assets [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Noncontrolling interests Equity, Attributable to Noncontrolling Interest Segments Segments [Axis] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Products Semiconductor Products And Solutions [Member] Semiconductor products and solutions. Total Stockholders’ Equity of UCT Parent [Member] 2029 Intangible Asset, Finite-Lived, Estimated Amortization Expense, Year Three Convertible notes (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities 2026 (remaining in year) Intangible Asset, Finite-Lived, Estimated Amortization Expense, Remainder of Fiscal Year Other income (expense), net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and Administrative Expense Long-Lived Asset, Class Long-Lived Asset, Class [Domain] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Schedule Of Property Plant And Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock — $0.001 par value, 10.0 shares authorized; none outstanding Preferred Stock, Value, Issued Discrete income tax expense Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount Adjustment to Compensation: Adjustment to Compensation [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest paid Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Credit Facility Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Assets Assets, Fair Value Disclosure Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Payment for capped call transactions Payment For Capped Call Transactions Payment For Capped Call Transactions Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Malaysia MALAYSIA Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-in Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Defined Contribution Plan [Table] Defined Contribution Plan [Table] Indefinite-lived Intangible Assets Intangible Asset, Indefinite-Lived, Class [Axis] Impairment of goodwill Goodwill, Impairment Loss Property, plant, and equipment, net, excluding construction in progress Property Plant And Equipment Net Excluding Construction In Progress Property plant and equipment net excluding construction in progress. Name Trading Arrangement, Individual Name Shares vesting period from date of grant Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period From Date Of Grant Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period From Date Of Grant Fees Recognized in Exchange for Servicing Financial Assets [Table] Fees Recognized in Exchange for Servicing Financial Assets [Table] Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Plan assets Plan Assets [Member] Plan assets. Net income (loss) Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Provision for income taxes Income tax provision Income Tax Expense (Benefit) Customer Concentration Risk Customer Concentration Risk [Member] 2026 Defined Benefit Plan, Expected Future Benefit Payment, Remainder of Fiscal Year Operating lease right-of-use assets and operating lease liabilities Increase Decrease In Operating Lease Assets And Liabilities Net Increase decrease in operating lease assets and liabilities net. Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Numerator: Net Income (Loss) Attributable to Parent [Abstract] South Korea South Korea KOREA, REPUBLIC OF Percentage expected target award range, minimum Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Net income (loss) attributable to UCT Net income (loss) attributable to UCT Net Income (Loss) Attributable to Parent Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Unamortized debt issuance costs Unamortized Debt Issuance Expense Proceeds from sale of equipment Proceeds from Sale of Property, Plant, and Equipment Statement [Table] Statement [Table] Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] 2030 Defined Benefit Plan, Expected Future Benefit Payment, Year Four Restatement Determination Date: Restatement Determination Date [Axis] Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income Investment Income, Interest Grant date fair value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value Number of consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Employee equity plan Share-Based Payment Arrangement [Member] Revenues: Revenues [Abstract] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]