Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Weighted-average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Trading Arrangement: Trading Arrangement [Axis] 8.25 Percent Note 8.25 Percent Note [Member] 8.25 Percent Note Maximum [Member] Maximum [Member] Loss Contingency, Cancellation Fee Ending Amount Loss Contingency, Cancellation Fee Ending Amount Loss Contingency, Cancellation Fee Ending Amount Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Segment Reporting [Abstract] Customer [Axis] Customer [Axis] Common stock Common Stock, Value, Issued Payment, Tax Withholding, Share-based Payment Arrangement Payment, Tax Withholding, Share-Based Payment Arrangement Pension and Postretirement Health and Life Benefits Retirement Benefits [Text Block] Restatement Determination Date Restatement Determination Date Expected return on plan assets (gains) Defined Benefit Plan, Expected Return (Loss) on Plan Assets Stock Issued During Period, Value, Gross Stock Issued During Period, Value, Gross Stock Issued During Period, Value, Gross Debt Instrument, Convertible, Conversion Price Debt Instrument, Convertible, Conversion Price Amendment Flag Amendment Flag Current Liabilities Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Government Assistance [Abstract] Contract Value Contract Value Contract Value Deferred tax assets Increase (Decrease) in Deferred Income Taxes Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Intangible assets, net Amortizable intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Average number of shares outstanding, basic Average number of shares outstanding, basic Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Loss Contingency, Possible Loss Not Accrued Loss Contingency, Range of Possible Loss, Portion Not Accrued Total current liabilities Liabilities, Current Deferred revenue – change Increase (Decrease) in Deferred Revenue Entity Address, City or Town Entity Address, City or Town Contract Phase [Domain] Contract Phase [Domain] Contract Phase [Domain] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Separative work units valuation change in period Borrowed inventory valuation change in period Borrowed inventory valuation change in period Technical Solutions Segment Technical Solutions Segment [Member] Technical Solutions Segment Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Product [Member] Product [Member] Class of Stock [Axis] Class of Stock [Axis] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Debt Issuance Costs, Gross Debt Issuance Costs, Gross Pension and postretirement liabilities - increase (decrease) Increase (Decrease) in Obligation, Pension Benefits Inventory, Net [Abstract] Inventory, Net [Abstract] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Accumulated intangible asset amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Long-term debt, current Long-Term Debt, Current Maturities United States UNITED STATES Cost obligated to DOE Cost obligated to DOE Cost obligated to DOE Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Recently Adopted Accounting Standards and Accounting Standards Effective in Future Periods New Accounting Pronouncements, Policy [Policy Text Block] Segment Reporting Information Segment Reporting [Table Text Block] Amortization of Debt Issuance Costs Amortization of Debt Issuance Costs Other Significant Noncash Transaction, Value of Consideration Given Other Significant Noncash Transaction, Value of Consideration Given Long-term debt Long-Term Debt Customer-Related Intangible Assets [Member] Customer-Related Intangible Assets [Member] Document Period End Date Document Period End Date Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] UF6 repaid in period, value UF6 repaid in period, value UF6 repaid in period, value Long-term debt, face amount Debt Instrument, Face Amount Stockholders' Equity Note Disclosure [Text Block] Equity [Text Block] Inventories, net Inventory net of Liability Inventory net of Liability Security Exchange Name Security Exchange Name Cash and Cash Equivalent, Held in Foreign Currency Cash and Cash Equivalent, Held in Foreign Currency Government Incentives Government Assistance [Text Block] Accumulated other comprehensive income (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Common Class B [Member] Common Class B [Member] Consolidation Items [Domain] Consolidation Items [Domain] Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Billed accounts receivable Billed Contracts Receivable Net Income (Loss) Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Unbilled contract revenue Unbilled Contracts Receivable Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] Capital expenditures Payments to Acquire Property, Plant, and Equipment Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Schedule of Restricted Cash and Cash Equivalents Restrictions on Cash and Cash Equivalents [Table Text Block] Amortization of Debt Issuance Costs and Discounts Amortization of Debt Issuance Costs and Discounts Defined Benefit Plan, Pension Plan Obligations Transferred Defined Benefit Plan, Pension Plan Obligations Transferred Defined Benefit Plan, Pension Plan Obligations Transferred Deferred Revenue and Advances from Customers - Current and Noncurrent Deferred Revenue and Advances from Customers - Current and Noncurrent Deferred Revenue and Advances from Customers - Current and Noncurrent Separative work units inventory Separative work units inventory Carrying amount as of the balance sheet date of separative work unit ("SWU") inventory. SWU is held as the SWU component of low enriched uranium. A SWU is the standard measure of uranium enrichment using a standard formula derived from the physics of enrichment. SWU costs are based on production costs and purchase costs. SWU inventory is valued at the lower of cost or market. Consolidated Balance Sheet [Abstract] Consolidated Balance Sheet [Abstract] Consolidated Balance Sheet [Abstract] Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Average number of shares outstanding, diluted Average number of shares outstanding, diluted Weighted Average Number of Shares Outstanding, Diluted Stock Issued During Period, Value, Net Stock Issued During Period, Value, Net Stock Issued During Period, Value, Net Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Customer C [Member] Customer C [Member] Customer C [Member] Convertible Debt Conversion Terms Two Convertible Debt Conversion Terms Two [Member] Convertible Debt Conversion Terms Two Contract Estimated Fee Contract Estimated Fee Contract Estimated Fee Gross profit (loss) Gross Profit Gross Profit Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Potentially dilutive shares related to stock options Weighted Average Number of Shares Outstanding, Diluted, Adjustment Uranium inventory Uranium Inventory Carrying amount as of the balance sheet date of uranium inventory. Uranium is held in the form of natural uranium and as the uranium component of low enriched uranium. Uranium inventory is valued at the lower of cost or market. Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Phase Scope Phase Scope [Member] Phase Scope Long-term SWU Loan Long-term Inventory Loans Long-term Inventory Loans Award Timing Predetermined Award Timing Predetermined [Flag] Defined Benefit Plan, Pension Plan Assets Transferred Defined Benefit Plan, Pension Plan Assets Transferred Defined Benefit Plan, Pension Plan Assets Transferred Intangible Asset, Goodwill and Other [Abstract] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Debt Instrument, Convertible, Conversion Ratio Debt Instrument, Convertible, Conversion Ratio Fair Value Option, Disclosures Fair Value Option, Disclosures [Table Text Block] All Executive Categories All Executive Categories [Member] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Other comprehensive income, net of tax Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax Preferred Stock, Par Value Per Share Preferred Stock, Par or Stated Value Per Share Long-term debt, fair value Long-Term Debt, Fair Value Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Adjustment to Right of Use Lease due to Modification [Domain] Adjustment to Right of Use Lease due to Modification [Domain] Adjustment to Right of Use Lease due to Modification Other financial assurance [Member] Other financial assurance [Member] Other financial assurance [Member] Scenario [Domain] Scenario [Domain] Contract-Based Intangible Assets [Member] Contract-Based Intangible Assets [Member] Schedule of Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Deferred revenue, net of deferred costs – increase (decrease) Increase Decrease in Deferred Revenue, Net of Deferred Costs Increase Decrease in Deferred Revenue, Net of Deferred Costs Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Information Segment Reporting [Text Block] Minimum [Member] Minimum [Member] Deposits for financial assurance Deposits Assets, Noncurrent Expiration Date Trading Arrangement Expiration Date Escrow Escrow [Member] Escrow Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Separative work units net of liability Separative work units net of liability Separative work units inventory net of liability Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Gain Contingencies [Table] Gain Contingencies [Table] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Debt Conversion Description [Axis] Debt Conversion Description [Axis] 0.0 Percent Convertible Note 0.0 Percent Convertible Note [Member] 0.0 Percent Convertible Note Uranium owed to customers and suppliers Uranium owed to customers and suppliers Uranium owed to customers and suppliers Net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Proceeds from the sale of common stock, net Proceeds from Issuance of Common Stock Common Stock, Shares Authorized Common Stock, Shares Authorized Average useful life of finite-lived intangible assets Intangible Asset, Finite-Lived, Useful Life Exercise Price Award Exercise Price Cash Flows Provided by Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Deferred compensation asset Cash Surrender Value, Fair Value Disclosure Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Purchase Price Increase Per Share Purchase Price Increase Per Share Purchase Price Increase Per Share Debt Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Debt Issuance Costs, Net Debt Issuance Costs, Net NumberOfReportableSegmentsNotDisclosedFlag NumberOfReportableSegmentsNotDisclosedFlag NumberOfReportableSegmentsNotDisclosedFlag Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Conversion credits, inventory Conversion credits, inventory Conversion credits, inventory Uranium [Member] Uranium [Member] Uranium [Member] - Natural uranium or the uranium component of Low Enriched Uranium (LEU). Contract Value, Award Task Contract Value, Award Task Contract Value, Award Task Adoption Date Trading Arrangement Adoption Date Workers compensation financial assurance [Member] Workers compensation financial assurance [Member] Workers compensation financial assurance [Member] Counterparty Name [Domain] Counterparty Name [Domain] Debt instrument interest rate Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Stockholders' Equity Beginning Balance Ending Balance Equity, Attributable to Parent 2.25% Convertible Notes 2.25% Convertible Notes [Member] 2.25% Convertible Notes Separative work units repaid in period, value Separative work units repaid in period, value Separative work units repaid in period, value ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Other current assets Prepaid Expense and Other Assets, Current Selling, general and administrative Selling, General and Administrative Expense Payment of interest classified as debt Repayments of Debt Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Table] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Antidilutive securities excluded from computation of earnings per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Customer B [Member] Customer B [Member] Customer B [Member] Uranium inventory net of liability Uranium inventory net of liability Uranium inventory net of liability Proceeds from Customers Proceeds from Customers Entity Central Index Key Entity Central Index Key Accumulated Depreciation, Property, Plant, and Equipment Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Separative Work Units [Member] Separative Work Units [Member] Separative Work Units (SWU) [Member] - SWU is a standard unit of measurement that represents the effort required to transform a given amount of natural uranium into two components: enriched uranium having a higher percentage of the uranium-235 isotope (“U235”) and depleted uranium having a lower percentage of U235. The SWU contained in LEU is calculated using an industry standard formula based on the physics of enrichment. The amount of enrichment deemed to be contained in LEU under this formula is commonly referred to as its SWU component and the quantity of natural uranium used in the production of LEU under this formula is referred to as its uranium component. 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 (Used in) Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Conversion credits owed to customers and suppliers Conversion credits owed to customers and suppliers Conversion credits owed to customers and suppliers Government cost share portion Government cost share portion Anticipated government cost share portion of new contract Total Amount Program Cost Total Amount Program Cost Total Amount Program Cost Income Statement [Abstract] Income Statement [Abstract] Stockholders' Deficit Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value, Assets and Liabilities Measured on 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Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Customer D [Member] Customer D [Member] Customer D [Member] Statement [Line Items] Statement [Line Items] Total Assets Assets Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Operating Segments Operating Segments [Member] EPC Contract EPC Contract [Member] EPC Contract Direct Costs of Stock Issuance Direct Costs of Stock Issuance Direct Costs of Stock Issuance Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues PEO PEO [Member] Debt, long-term and short-term, combined carrying value Debt, Long-Term and Short-Term, Combined Amount Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Other long-term liabilities Other Liabilities, Noncurrent Retirement Plan Type [Axis] Retirement Plan Type [Axis] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other Significant Noncash Transaction [Axis] Other Significant Noncash Transaction [Axis] HALEU Enrichment Contract HALEU Enrichment Contract [Member] HALEU Enrichment Contract Accumulated Deficit [Member] Retained Earnings [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Net income (loss) per common share - diluted Earnings Per Share, Diluted Technical Solutions Segment [Member] Contract Services Segment [Member] Contract Services Segment [Member] Entity Current Reporting Status Entity Current Reporting Status Net Cash (Used in) Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Shares withheld for employee taxes Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Company cost share portion Company cost share portion Company cost share portion Amortization of intangible assets Intangible Asset, Finite-Lived, Amortization Expense Intangible Asset, Finite-Lived, Amortization Expense Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Accounts payable under purchase agreements Accounts Payable under Purchase Agreements Accounts Payable under Purchase Agreements Advanced technology license and decommissioning costs Research and Development Expense Adjustments to reconcile net income (loss) to net cash (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash Flows Used in Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Revenue from Contract with Customer, Excluding Assessed Tax Revenue Revenue from Contract with Customer, Excluding Assessed Tax Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Interest costs Defined Benefit Plan, Interest Cost Segment Reporting, Revenue [Abstract] Segment Reporting, Revenue [Abstract] Inventories Inventory Disclosure [Text Block] Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Customer A [Member] Customer A [Member] Customer A [Member] Intangible Assets Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Amortizable intangible assets, gross Intangible Asset, Excluding Goodwill, before Accumulated Amortization Revenue from Contract with Customer Revenue from Contract with Customer [Text Block] Stock issued during period Stock Issued During Period, Value, New Issues Increase (Decrease) in Prepaid Expenses, Other Increase (Decrease) in Prepaid Expenses, Other Preferred Stock [Member] Preferred Stock [Member] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Customer, Extent of Reliance [Line Items] Inventories – (increase) decrease Increase (Decrease) in Inventories Phase 2 Phase 2 [Member] Phase 2 Segment Reporting [Table] Segment Reporting [Table] Revaluation of inventory borrowing Revaluation of inventory borrowing Revaluation of inventory borrowing Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Continuing Operation [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Fair Value Measurements, Recurring and Nonrecurring Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating income (loss) Operating Income (Loss) Service [Member] Service [Member] Revenue, remaining performance obligation, amount Revenue, Remaining Performance Obligation, Amount Current Fiscal Year End Date Current Fiscal Year End Date Conversion credits, net of liability Conversion credits, net of liability Conversion credits, net of liability Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] 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] Collateral for Inventory Loan [Member] Collateral for Inventory Loan [Member] Collateral for Inventory Loan Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Service costs Defined Benefit Plan, Service Cost Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Convertible senior notes (Predecessor) Short-Term Inventory Loans Short-Term Inventory Loans Gain Contingencies [Line Items] Gain Contingencies [Line Items] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Common Stock, Shares, Issued Common Stock, Shares, Issued Measure: Measure [Axis] Loss Contingency, Cancellation Fee, Value Per Month Decrease Loss Contingency, Cancellation Fee, Value Per Month Decrease Loss Contingency, Cancellation Fee, Value Per Month Decrease Equity related compensation Equity Related Compensation Equity Related Compensation Equity Components [Axis] Equity Components [Axis] Accounts receivable – (increase) decrease Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Income Tax Paid, after Refund Received Income Tax Paid, after Refund Received Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Common Class A [Member] Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Entity Small Business Entity Small Business Termination Date Trading Arrangement Termination Date Payables under SWU purchase agreements – increase (decrease) Increase (Decrease) in Accounts Payable, Trade Subsequent Events [Abstract] Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] 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 long-term assets Other Assets, Noncurrent Document Type Document Type Other Significant Noncash Transaction, Name [Domain] Other Significant Noncash Transaction, Name [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Gain (Loss) on Extinguishment of Debt Fair Value as of Grant Date Award Grant Date Fair Value Repayments of Convertible Debt Repayments of Convertible Debt Increase Decrease in Inventories Owed to Suppliers Increase Decrease in Inventories Owed to Suppliers Increase Decrease in Inventories Owed to Suppliers 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 Postretirement Health and Life Benefits Plans [Member] Other Postretirement Benefits Plan [Member] Other Operating Activities, Cash Flow Statement Other reconciling adjustments, net Other reconciling adjustments, net Consolidation Items [Axis] Consolidation Items [Axis] Contract Phase [Axis] Contract Phase [Axis] Contract Phase Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Restrictions on Cash and Cash Equivalents [Table] Restrictions on Cash and Cash Equivalents [Table] Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 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 (Note 11) Commitments and Contingencies Total Revenue Revenue Revenues Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounts payable and other liabilities – increase (decrease) Increase (Decrease) in Accounts Payable and Accrued Liabilities Inventories owed to customers and suppliers Inventories owed to customers and suppliers Inventories owed to customers and suppliers Cost of SWU and uranium inventories owed related to the transfer of title from USEC to customer at fabricator whereby fabricator has elected to order less material from USEC than is required. Amounts owed are satisfied when fabricator orders future bulk deliveries. Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Changes in operating assets and liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT) Liabilities and Equity [Abstract] Share-Based Payment Arrangement, Reclassification From Equity To Liability Share-Based Payment Arrangement, Reclassification From Equity To Liability Share-Based Payment Arrangement, Reclassification From Equity To Liability Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Inventories Inventories Inventory, Net All Award Types Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Property, plant and equipment included in accounts payable and accrued liabilities [Member] Property, plant and equipment included in accounts payable and accrued liabilities [Member] Property, plant and equipment included in accounts payable and accrued liabilities Fair Value Measurements Fair Value Disclosures [Text Block] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] PEO Name PEO Name Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Geographical [Axis] Geographical [Axis] Restricted Cash Restricted Cash Nonoperating components of net periodic benefit expense (income) Net Periodic Defined Benefits Expense (Reversal of Expense), Excluding Service Cost Component Payments for Share-Based Compensation Arrangement Reclassification Payments for Share-Based Compensation Arrangement Reclassification Payments for Share-Based Compensation Arrangement Reclassification Contract Minimum Fee Contract Minimum Fee Contract Minimum Fee Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Interest expense Interest Expense, Debt Cash, cash equivalents and restricted cash, start of period Cash, cash equivalents and restricted cash, end of period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] 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] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Restricted cash included in other current assets Restricted Cash and Cash Equivalent, Current Contract With Customer, Advances, Liability, Current Contract With Customer, Advances, Liability, Current Contract With Customer, Advances, Liability, Current 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] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Labor and Related Expense Labor and Related Expense Government [Member] Government [Member] Schedule of Debt Schedule of Debt [Table Text Block] Customer [Domain] Customer [Domain] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Net income (loss) per common share - basic Earnings Per Share, Basic Deferred revenue Deferred Revenue Contract with Customer, Liability, Current Contract with Customer, Liability, Current Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Government Assistance [Line Items] Government Assistance [Line Items] Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Debt Instrument, Convertible, Threshold 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] Pension Plan, Defined Benefit [Member] Pension Plan [Member] Deferred compensation obligation Obligations, Fair Value Disclosure Common Stock [Member] Common Stock [Member] Separative work units owed to customers and suppliers Separative work units owed to customers and suppliers Separative work units owed to customers and suppliers Low Enriched Uranium Segment [Member] Low Enriched Uranium Segment [Member] Low Enriched Uranium Segment [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Total foreign Non-US [Member] Equity Awards Adjustments Equity Awards Adjustments [Member] Total Liabilities and Stockholders’ Equity (Deficit) Liabilities and Equity Convertible Debt Conversion Terms One Convertible Debt Conversion Terms One [Member] Convertible Debt Conversion Terms One HALEU Ops Contract HALEU Ops Contract [Member] HALEU Ops Contract Employee Stock Option Share-Based Payment Arrangement, Option [Member] Current debt Debt, Current Cash, Cash Equivalents and Restricted Cash [Abstract] Cash, Cash Equivalents and Restricted Cash [Abstract] Cash, Cash Equivalents and Restricted Cash [Abstract] Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Proceeds from Issuance of Senior Long-Term Debt Proceeds from Issuance of Senior Long-Term Debt Tabular List, Table Tabular List [Table Text Block] Restricted cash included in other long-term assets Restricted Cash and Cash Equivalent, Noncurrent Excess of capital over par value Additional Paid in Capital Long-term debt, interest Other Long-Term Debt Other Nonoperating Income Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] Schedule of Intangible Assets and Excess Reorganization Value [Table Text Block] 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] LEU Segment LEU Segment [Member] LEU Segment Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred stock Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Phase 1 Phase 1 [Member] Phase 1 Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Interest Paid, Excluding Capitalized Interest, Operating Activity Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Deferred revenue, revenue recognized Deferred Revenue, Revenue Recognized Advances from customers, current Advances from customers change Advances from customers change Government Assistance [Table] Government Assistance [Table] Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Retirement Benefits, Description [Abstract] Retirement Benefits, Description [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Excess of Capital over Par Value [Member] Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Fluor Fluor [Member] Fluor Name Trading Arrangement, Individual Name Deferred costs associated with deferred revenue Other Deferred Costs, Net Cash and cash equivalents Cash and Cash Equivalent Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Cash and Cash Equivalents Disclosure Cash and Cash Equivalents Disclosure [Text Block] Entity Address, Address Line Two Entity Address, Address Line Two Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Current Assets Assets, Current [Abstract] Debt Conversion, Name [Domain] Debt Conversion, Name [Domain] Non-PEO NEO Non-PEO NEO [Member] Senior Notes [Member] Senior Notes [Member] Entity Address, Address Line One Entity Address, Address Line One Provision (benefit) for income taxes Income Tax Expense (Benefit) Cost of sales Cost of Product and Service Sold Option 1b Option 1b [Member] Option 1b Award Timing Method Award Timing Method [Text Block] Decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast [Member] Forecast [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Government cost share, percentage Government cost share, percentage Government cost share, percentage HALEU Demo Contract HALEU Demo Contract [Member] HALEU Demo Contract Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Shares withheld for employee taxes [Member] Shares withheld for employee taxes [Member] Shares withheld for employee taxes; Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Restatement Determination Date: Restatement Determination Date [Axis] Exercise of stock options Proceeds from Stock Options Exercised Investment income Investment Income, Interest Loss Contingency, Cancellation Fee Initial Amount Loss Contingency, Cancellation Fee Initial Amount Loss Contingency, Cancellation Fee Initial Amount Contract with Customer, Asset and Liability Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Option 1a Option 1a [Member] Option 1a Debt Instrument, Convertible, Threshold Consecutive Trading Days Debt Instrument, Convertible, Threshold Consecutive Trading Days Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Postretirement health and life benefit obligations Liability, Other Postretirement Defined Benefit Plan, Noncurrent Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]