Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Note Disclosure [Text Block] Stockholders' Equity Note Disclosure [Text Block] Accounting Policies [Abstract] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) [Abstract] CONDENSED CONSOLIDATED BALANCE SHEET (Parenthetical) [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Predecessor [Member] Predecessor [Member] Successor [Member] Successor [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement [Line Items] Statement [Line Items] Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Treasury Stock, Shares Treasury Stock, Shares Research and Development [Abstract] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Government [Member] Government [Member] Scenario, Forecast [Member] Scenario, Forecast [Member] Maximum RD&D Program Funding by DOE Maximum RD&D Program Funding by DOE Maximum RD&D Program Funding by DOE ACTDO DOE Funding – Increment 1 ACTDO DOE Funding – Increment 1 ACTDO DOE Funding – Increment 1 RD&D Program Funding by DOE RD&D Program Funding by DOE RD&D Program Funding by DOE RD&D Program Funding by USEC RD&D Program Funding by USEC RD&D Program Funding by DOE RD&D Program Qualifying Expenditures - Total RD&D Program Qualifying Expenditures To Date RD&D Program Qualifying Expenditures To Date RD&D Program Qualifying Expenditures - DOE Share Total RD&D Program Qualifying Expenditures To Date - DOE Share RD&D Program Qualifying Expenditures To Date - DOE Share RD&D Program Qualifying Expenditures – USEC Share Total RD&D Program Qualifying Expenditures – USEC Share RD&D Program Qualifying Expenditures – USEC Share RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable RD&D Program Qualifying Expenditures To Date - DOE Share - Receivable RD&D Program Qualifying Expenditures - DOE Share - Other Income Other Operating Income Advanced technology costs Research and Development Expense Accounts Receivable, Net, Current [Abstract] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Legal Entity of Counterparty, Type [Axis] Legal Entity of Counterparty, Type [Axis] Legal Entity Type of Counterparty [Domain] Legal Entity Type of Counterparty [Domain] Corporation [Member] Corporation [Member] Government - portion related to retiree benefits [Member] Government - portion related to retiree benefits [Member] Government - portion related to retiree benefits [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts Receivable, Gross, Noncurrent Accounts Receivable, Gross, Noncurrent Proceeds from DOE on Claims Proceeds from Customers Accounts Receivable, Net, Noncurrent Accounts Receivable, Net, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent General Discussion of Pension and Other Postretirement Benefits [Abstract] Schedule of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Defined Benefit Pension Plans [Member] Pension Plan [Member] Postretirement Health and Life Benefits Plans [Member] Other Postretirement Benefit Plan [Member] Service costs Defined Benefit Plan, Service Cost Interest costs Defined Benefit Plan, Interest Cost Expected return on plan assets (gains) Defined Benefit Plan, Expected Return on Plan Assets Amortization of actuarial (gains) losses, net Defined Benefit Plan, Amortization of Gains (Losses) Amortization of prior service costs (credits) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Curtailment gains Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Net benefit costs Defined Benefit Plan, Net Periodic Benefit Cost Reorganizations Items, Net [Abstract] Reorganizations Items, Net [Abstract] Reorganization Items, Net [Table Text Block] Reorganization Items, Net [Table Text Block] Reorganization Items, Net [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Reduction in amount of third party debt obligations Reduction in amount of third party debt obligations Reduction in amount of third party debt obligations Gain on sale of subsidiary Gain (Loss) on Disposition of Business Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Common Class A [Member] Common Class A [Member] Common Class B [Member] Common Class B [Member] Class of Stock [Line Items] Class of Stock [Line Items] Common Stock, Shares Reserved for Future Issuance Under Management Incentive Plan Common Stock, Capital Shares Reserved for Future Issuance Earnings Per Share [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Convertible Debt [Member] Convertible Debt [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Interest expense Interest Expense, Debt Maximum percentage of common stock shares for preferred stock conversion Maximum percentage of common stock shares for preferred stock conversion Maximum percentage of common stock shares for preferred stock conversion under NYSE rules prior to shareholder approval Maximum number of common stock shares for preferred stock conversion Maximum number of common stock shares for preferred stock conversion Maximum number of common stock shares for preferred stock conversion under NYSE rules prior to obtaining shareholder approval Chapter 11 Filing [Abstract] Chapter 11 Filing [Abstract] Total Stock, Shares Authorized Total Stock, Shares Authorized Total Stock, Shares Authorized Long-term debt Long-term Debt Convertible senior notes Long-term Debt, Current Maturities Convertible Noteholders, Percent of New Common Stock Convertible Noteholders, Percent of New Common Stock Convertible Noteholders, Percent of New Common Stock Convertible Noteholders, New Notes Convertible Noteholders, New Notes Convertible Noteholders, New Notes Preferred Stock, Dividend Rate, Percentage Preferred Stock, Dividend Rate, Percentage Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Convertible preferred stock (Predecessor), 85,900 shares issued Other Long-term Debt, Current Class of Warrant or Right, Outstanding Class of Warrant or Right, Outstanding Preferred Investors, Each, Percent of New Common Stock Preferred Investors, Each, Percent of New Common Stock Preferred Investors, Each, Percent of New Common Stock Preferred Investors, Aggregate, Percent of New Common Stock Preferred Investors, Aggregate, Percent of New Common Stock Preferred Investors, Aggregate, Percent of New Common Stock Preferred Investors, Each, New Notes Preferred Investors, Each, New Notes Preferred Investors, Each, New Notes Preferred Investors, Aggregate, New Notes Preferred Investors, Aggregate, New Notes Preferred Investors, Aggregate, New Notes Stockholders, Percent of New Common Stock Stockholders, Percent of New Common Stock Stockholders, Percent of New Common Stock Debtor in possession financing repayments Debtor in possession financing repayments Debtor in possession financing repayments Advanced Technology Costs and Other Income Research, Development, and Computer Software Disclosure [Text Block] Net Income (Loss) Per Share Earnings Per Share [Text Block] Income Tax Disclosure [Abstract] Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Reorganization under Chapter 11 of US Bankruptcy Code Disclosure Reorganization under Chapter 11 of US Bankruptcy Code Disclosure [Text Block] Pension Plan A [Member] Other Pension Plan [Member] Pension Plan B [Member] Pension Plan B [Member] Pension Plan B [Member] Pension Plan C [Member] Pension Plan C [Member] Pension Plan C [Member] Expected defined benefit plan contributions for current fiscal year Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Expected defined benefit plan contributions for current fiscal year under ERISA Expected defined benefit plan contributions for current fiscal year under ERISA Expected defined benefit plan contributions for current fiscal year under ERISA Expected defined benefit plan contributions for current fiscal year for non-qualified plans Expected defined benefit plan contributions for current fiscal year for non-qualified plans Expected defined benefit plan contributions for current fiscal year for non-qualified plans USEC contributions Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Lump Sum Benefits Paid Defined Benefit Plan, Lump Sum Benefits Paid Defined Benefit Plan, Lump Sum Benefits Paid Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate Defined Benefit Plan, Actuarial Gain (Loss) Defined Benefit Plan, Actuarial Gain (Loss) Fresh-Start Adjustment, Increase (Decrease), Accumulated Other Comprehensive Income (Loss) Fresh-Start Adjustment, Increase (Decrease), Accumulated Other Comprehensive Income (Loss) Fresh Start Accounting [Abstract] Fresh Start Accounting [Abstract] Reconciliation Of Enterprise Value To Estimated Fair Value [Table Text Block] Reconciliation Of Enterprise Value To Estimated Fair Value [Table Text Block] Reconciliation Of Enterprise Value To Estimated Fair Value [Table Text Block] Reconciliation Of Enterprise Value To Estimated Reorganization Value [Table Text Block] Reconciliation Of Enterprise Value To Estimated Reorganization Value [Table Text Block] Reconciliation Of Enterprise Value To Estimated Reorganization Value [Table Text Block] Schedule of Fresh-Start Adjustments [Table Text Block] Schedule of Fresh-Start Adjustments [Table Text Block] Schedule Of Cash Payments For Reorganization Adjustments [Table Text Block] Schedule Of Cash Payments For Reorganization Adjustments [Table Text Block] Schedule Of Cash Payments For Reorganization Adjustments [Table Text Block] Schedule Of Cumulative Impact Of Reorganization Adjustments [Table Text Block] Schedule Of Cumulative Impact Of Reorganization Adjustments [Table Text Block] Schedule Of Cumulative Impact Of Reorganization Adjustments [Table Text Block] Schedule Of Allocation of Reorganization Value to Assets [Table Text Block] Schedule Of Allocation of Reorganization Value to Assets [Table Text Block] Schedule Of Allocation of Reorganization Value to Assets [Table Text Block] Schedule Of Cumulative Impact Of Fresh Start Adjustments [Table Text Block] Cumulative Impact Of Fresh Start Adjustments [Table Text Block] Cumulative Impact Of Fresh Start Adjustments [Table Text Block] Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Segment Reporting Information, Revenue for Reportable Segment [Abstract] Revenues [Abstract] Revenues [Abstract] Separative work units Separative work units Revenue derived from sales of the separative work unit (SWU) component of low enriched uranium (LEU). Uranium Uranium Revenue derived from sales of uranium and the uranium component of low enriched uranium (LEU). Revenue from low enriched uranium segment Revenue from low enriched uranium segment Revenue from low enriched uranium segment Contract services Contracts Revenue Total revenue Revenues LEU segment gross profit Gross Profit From Low Enriched Uranium Segment Gross Profit From Low Enriched Uranium Segment Contract services segment gross profit Contracts Gross Profit Contracts Gross Profit Gross profit Gross profits all segments Gross profits all segments Income Statement [Abstract] Revenue: Cost of Sales: Cost of Revenue [Abstract] Separative work units and uranium Cost of Goods Sold Contract services Contract Revenue Cost Total cost of sales Cost of Revenue Gross profit (loss) Gross Profit Selling, general and administrative Selling, General and Administrative Expense Special charges for workforce reductions and advisory costs Restructuring Charges Other (income) Operating (loss) Operating Income (Loss) Interest (income) Investment Income, Interest Reorganization items, net Reorganization Items Income (loss) from continuing operations before income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision (benefit) for income taxes Income Tax Expense (Benefit) Income (loss) from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income (loss) Net Income (Loss) Attributable to Parent Income (loss) from continuing operations - per basic share Income (Loss) from Continuing Operations, Per Basic Share Income (loss) from continuing operations - per diluted share Income (Loss) from Continuing Operations, Per Diluted Share Net income (loss) per basic share Earnings Per Share, Basic Net income (loss) per diluted share Earnings Per Share, Diluted Weighted-average number of shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of shares outstanding - basic Weighted Average Number of Shares Issued, Basic Weighted average number of shares outstanding - diluted Weighted Average Number of Shares Outstanding, Diluted Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable Accounts Receivable, Net, Current Inventories Inventory, Net Deferred costs associated with deferred revenue Other Deferred Costs, Net Other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Deferred income taxes Deferred Tax Assets, Net, Noncurrent Deposits for surety bonds Deposits Assets, Noncurrent Intangible assets Intangible Assets, Net (Excluding Goodwill) Excess reorganization value Goodwill Other long-term assets Other Assets, Noncurrent Total Assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT) Liabilities and Equity [Abstract] Current Liabilities Liabilities, Current [Abstract] Accounts payable and accrued liabilities Accounts Payable and Accrued Liabilities, Current Payables under Russian Contract Accounts Payable, Current Deferred income taxes Deferred Tax Liabilities, Net, Current 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. Deferred revenue Deferred Revenue and Credits, Current Convertible senior notes (Predecessor) Short-term Bank Loans and Notes Payable Total current liabilities Liabilities, Current Postretirement health and life benefit obligations Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent Pension benefit liabilities Defined Benefit Pension Plan, Liabilities, Noncurrent Liabilities subject to compromise Liabilities Subject to Compromise Total liabilities Liabilities, Noncurrent Commitments and contingencies (Note 19) Commitments and Contingencies Common stock Common Stock, Value, Issued Excess of capital over par value Additional Paid in Capital Retained earnings (deficit) Retained Earnings (Accumulated Deficit) Treasury stock Treasury Stock, Value Accumulated other comprehensive income (loss), net of tax Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity (deficit) Stockholders' Equity Attributable to Parent Total Liabilities and Stockholders’ Equity (Deficit) Liabilities and Equity Statement of Comprehensive Income [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Net income (loss) Gain arising during the period Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax Curtailment (gain) recognized in net income Amortization of actuarial (gains) losses, net Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax Amortization of prior service costs (credits) Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax Other comprehensive income (loss), before tax Other Comprehensive Income (Loss), before Tax Income tax expense related to items of other comprehensive income Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Elimination of Predecessor Company accumulated other comprehensive loss Elimination of Predecessor Company accumulated other comprehensive loss Elimination of Predecessor Company accumulated other comprehensive loss Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Statement of Stockholders' Equity [Abstract] Common Stock Par Value $.10 per Share [Member] Common Stock [Member] Excess of Capital over Par Value [Member] Additional Paid-in Capital [Member] Retained Earnings (Deficit) [Member] Retained Earnings [Member] Treasury Stock [Member] Treasury Stock [Member] Beginning Balance Other comprehensive income, net of tax (Note 20) Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax Restricted and other common stock issued, net of amortization Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Restricted Stock Award, Forfeitures Restricted Stock Award, Forfeitures Ending Balance Elimination of Predecessor Company equity Elimination of Predecessor Company equity Elimination of Predecessor Company equity Issuance of Successor Company common stock and excess of capital over par value Issuance of Successor Company common stock and excess of capital over par value Issuance of Successor Company common stock and excess of capital over par value Property, Plant and Equipment [Abstract] Property, Plant and Equipment Disclosure Property, Plant and Equipment Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Accounts Payable and Accrued Liabilities [Abstract] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accounts Payable and Accrued Liabilities Disclosure [Text Block] Share-based Compensation [Abstract] Restricted stock and restricted stock units Restricted Stock or Unit Expense Stock options, performance awards and other Stock or Unit Option Plan Expense Expense included in selling, general and administrative and advanced technology costs Allocated Share-based Compensation Expense Reorganizations [Abstract] Restructuring and Related Costs [Table Text Block] Restructuring and Related Costs [Table Text Block] Inventory, Net [Abstract] Inventories Inventory Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] ACTDO DOE Funding – Exercised Contract Total ACTDO DOE Funding – Exercised Contract Total ACTDO DOE Funding – Exercised Contract Total ACTDO DOE Funding – Monthly ACTDO DOE Funding – Monthly ACTDO DOE Funding – Monthly ACTDO DOE Funding – Option ACTDO DOE Funding – Each of Two Options ACTDO DOE Funding – Each of Two Options ACTDO DOE Funding – Total ACTDO DOE Funding – Total ACTDO DOE Funding – Total Decontamination and Decommisioning Obligation, Noncurrent Asset Retirement Obligations, Noncurrent Cash collateralized surety bonds Restricted Investments, Noncurrent NYSE 30-day Average Minimum Market Capitalization NYSE 30-day average minimum market capitalization NYSE 30-day average minimum market capitalization NYSE Minimum 30 Day Average Closing Price NYSE Minimum 30 Day Average Closing Price NYSE Minimum 30 Day Average Closing Price PBGC estimate of potential Portsmouth pension liability PBGC estimate of potential Portsmouth pension liability PBGC estimate of potential Portsmouth pension liability Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Contract-Based Intangible Assets [Member] Contract-Based Intangible Assets [Member] Customer-Related Intangible Assets [Member] Customer-Related Intangible Assets [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Intangible Assets Disclosure [Abstract] Intangible Assets Disclosure [Abstract] 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] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Securities Excluded from Net Income Per Share Schedule of Securities Excluded from Net Income Per Share [Table Text Block] [Table Text Block] for Schedule of Securities Excluded from Net Income Per Share [Table] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Fresh-Start Adjustment, Increase (Decrease), Inventories Fresh-Start Adjustment, Increase (Decrease), Inventories Inventories provided by customers and suppliers Inventories Provided by Customers and Suppliers Uranium held by USEC to which title was held by customers and suppliers and for which no assets or liabilities were recorded on the balance sheet Decline in Uranium Quantities Provided by Customers and Suppliers Decline in Uranium Quantities Provided by Customers and Suppliers Decline in Uranium Quantities Provided by Customers and Suppliers Fair Value Disclosures [Abstract] Schedule of Financial Instruments Recorded at Fair Value Fair Value, Measurement Inputs, Disclosure [Text Block] Schedule of Fair Value of Debt Fair Value of Debt Table Text Block Fair Value of Debt Table Text Block Payments of Financing Costs Payments of Financing Costs Enterprise Value Enterprise Value Enterprise Value Long-term Debt Common Stock, Value, Outstanding Common Stock, Value, Outstanding Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Shares Issued, Price Per Share Shares Issued, Price Per Share Other Liabilities, Fair Value Disclosure Other Liabilities, Fair Value Disclosure Reorganization Value Reorganization Value Interest Paid Interest Paid Payments for Fees Payments for Fees Payment of Claims Payment Of Claims Payment Of Claims Payment of Reorganization Adjustments Payment of Reorganization Adjustments Payment of Reorganization Adjustments Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest Liabilities Subject to Compromise, Debt and Accrued Interest Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable Liabilities Subject to Compromise, Other Liabilities Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities Fresh-Start Adjustment, Increase (Decrease), Prepaid and Other Current Assets Fresh-Start Adjustment, Increase (Decrease), Prepaid and Other Current Assets Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities Revaluation of deferred revenue, net of deferred costs Revaluation of deferred revenue, net of deferred costs Revaluation of deferred revenue, net of deferred costs Fresh-Start Adjustment, Increase (Decrease), Amortizable Intangible Assets Fresh-Start Adjustment, Increase (Decrease), Amortizable Intangible Assets Utility Customer Receivables Utility Customer Receivables Utility Customer Receivables DOE pro-rata share of Cooperative Agreement funding Contract Services Customer Receivables Contract Services Customer Receivables Contract Services Customer Receivables Accounts Receivable, Net Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Adjustments to reconcile net income (loss) to net cash (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Reorganization items, non-cash Other Noncash Expense Transfers and retirements of machinery and equipment Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Convertible preferred stock dividends payable-in-kind Other Noncash Income (Expense) Gain on sales of assets and subsidiary Inventory valuation adjustments Asset Impairment Charges Changes in operating assets and liabilities: Increase (Decrease) in Operating Liabilities [Abstract] Accounts receivable – (increase) decrease Increase (Decrease) in Accounts Receivable Inventories, net – (increase) decrease Increase (Decrease) in Inventories Payables under Russian Contract – increase (decrease) Increase (Decrease) in Accounts Payable, Trade Deferred revenue, net of deferred costs – increase (decrease) Increase (Decrease) in Deferred Revenue Accrued depleted uranium disposition - increase (decrease) Increase (Decrease) in Other Accrued Liabilities Accounts payable and other liabilities – (decrease) Increase (Decrease) in Accounts Payable and Accrued Liabilities Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net Cash (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Cash Flows Provided by Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Deposits for surety bonds - net (increase) decrease Increase (Decrease) in Restricted Cash Proceeds from sales of assets and subsidiary Proceeds from Divestiture of Businesses Net Cash Provided by Investing Activities Net Cash Provided by (Used in) Investing Activities Cash Flows Used in Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Repayment of credit facility term loan Repayments of Debt, Maturing in More than Three Months Payments for deferred financing costs Common stock issued (purchased), net Proceeds from (Repurchase of) Equity Net Cash (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Net (Decrease) Cash and Cash Equivalents, Period Increase (Decrease) Cash and Cash Equivalents at Beginning of Period Cash and Cash Equivalents at End of Period Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] Interest paid Interest Paid, Net Income taxes paid, net of refunds Income Taxes Paid Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Reorganization Items, Net [Text Block] Reorganization Items, Net [Text Block] Reorganization Items, Net [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Subsequent Event [Abstract] Subsequent Event [Abstract] Subsequent Event [Table] Subsequent Event [Table] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Chief Executive Officer [Member] Chief Executive Officer [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Event [Line Items] Payments for Postemployment Benefits Payments for Postemployment Benefits Officers' Compensation Officers' Compensation Severance Costs Severance Costs Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Leasehold Improvements [Member] Leasehold Improvements [Member] Machinery and Equipment [Member] Machinery and Equipment [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Property, Plant and Equipment, Transfers and Changes Property, Plant and Equipment, Transfers and Changes Property, Plant and Equipment, Gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Depreciation Depreciation Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, Plant and Equipment, Net Accumulated Depreciation, Depletion and Amortization, Write-down of Property, Plant and Equipment Impairment of Long-Lived Assets Held-for-use Property, Plant and Equipment, Net Fresh-Start Adjustment, Increase (Decrease), Leasehold Improvements Fresh-Start Adjustment, Increase (Decrease), Leasehold Improvements Fresh-Start Adjustment, Increase (Decrease), Other Property and Equipment Fresh-Start Adjustment, Increase (Decrease), Other Property and Equipment Fresh-Start Adjustment, Increase (Decrease), Accumulated Depreciation and Amortization Fresh-Start Adjustment, Increase (Decrease), Accumulated Depreciation and Amortization Fresh Start Accounting [Text Block] Fresh Start Accounting [Text Block] Fresh Start Accounting [Text Block] Schedule of Accrued Liabilities [Table Text Block] Schedule of Accrued Liabilities [Table Text Block] Debt Disclosure [Abstract] Payment in Kind (PIK) Note [Member] Payment in Kind (PIK) Note [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Debt Disclosure [Text Block] Debt Disclosure [Text Block] Inventory, Current [Table] Inventory, Current [Table] Inventory [Axis] Inventory [Axis] Inventory [Domain] Inventory [Domain] Inventory [Line Items] Inventory [Line Items] 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. 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. Materials and supplies Other Inventory, Supplies, Gross Inventories Separative work units owed to customers and suppliers Separative work units owed to customers and suppliers Separative work units owed to customers and suppliers Uranium owed to customers and suppliers Uranium owed to customers and suppliers Uranium owed to customers and suppliers Inventories owed to customers and suppliers Separative work units net of liability Separative work units net of liability Separative work units inventory net of liability Uranium inventory net of liability Uranium inventory net of liability Uranium inventory net of liability Inventories, net Inventory net of Liability Inventory net of Liability Reorganization items, professional fees Debtor Reorganization Items, Legal and Advisory Professional Fees Reorganization items, expense of deferred financing costs Debtor Reorganization Items, Write-off of Deferred Financing Costs and Debt Discounts Gain on cancellation of convertible senior notes, net Gain on cancellation of convertible senior notes, net Gain on cancellation of convertible senior notes, net Gain on cancellation of convertible preferred stock, net Gain on cancellation of convertible preferred stock, net Gain on cancellation of convertible preferred stock, net Expense of unamortized restricted stock Expense of unamortized restricted stock Expense of unamortized restricted stock Gain related to the freeze of SERP benefits Gain related to the freeze of SERP benefits Gain related to the freeze of SERP benefits Revaluation of deferred revenue, net of deferred costs Revaluation of inventory Revaluation of inventory Revaluation of inventory Valuation of intangible assets Valuation of intangible assets Valuation of intangible assets Remeasurement of pension and postretirement benefit obligations Remeasurement of pension and postretirement benefit obligations Remeasurement of pension and postretirement benefit obligations Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations Elimination of Predecessor Company accumulated other comprehensive loss related to pension and postretirement benefit obligations Reorganization items, net Reorganization items, net, paid Reorganization Items, Net, Paid Reorganization Items, Net, Paid Accrued professional fees, current Accrued Professional Fees, Current Long-term debt, fair value Long-term Debt, Fair Value Convertible senior notes, fair value Convertible Debt, Fair Value Disclosures Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Debt Interest Rate, Cash Debt Interest Rate, Cash Debt Interest Rate, Cash Debt Interest Rate, PIK Debt Interest Rate, PIK Debt Interest Rate, PIK Fresh-Start Adjustments [Table] Fresh-Start Adjustments [Table] Pre Eliminations [Member] Pre Eliminations [Member] Pre Eliminations [Member] Fresh-Start Adjustments [Axis] Fresh-Start Adjustments [Axis] Type of Fresh-Start Adjustment [Domain] Type of Fresh-Start Adjustment [Domain] Fresh-Start Adjustment [Line Items] Fresh-Start Adjustment [Line Items] Total current assets Total Assets Total current liabilities Total liabilities Total stockholders’ equity (deficit) Total Liabilities and Stockholders’ Equity (Deficit) Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract] Fresh-Start Adjustment, Increase (Decrease), Assets [Abstract] Fresh-Start Adjustment, Increase (Decrease), Cash and Cash Equivalents Fresh-Start Adjustment, Increase (Decrease), Cash and Cash Equivalents Fresh-Start Adjustment, Increase (Decrease), Prepaid and Other Current Assets Fresh-Start Adjustment, Increase (Decrease), Current Assets Fresh-Start Adjustment, Increase (Decrease), Current Assets Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Assets, Noncurrent Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Assets, Noncurrent Fresh-Start Adjustment, Increase (Decrease), Excess Reorganization Value Fresh-Start Adjustment, Increase (Decrease), Goodwill Fresh-Start Adjustment, Increase (Decrease), Other Assets, Noncurrent Fresh-Start Adjustment, Increase (Decrease), Other Assets, Noncurrent Fresh-Start Adjustment, Increase (Decrease), Assets Fresh-Start Adjustment, Increase (Decrease), Assets Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract] Fresh-Start Adjustment, Increase (Decrease), Liabilities [Abstract] Fresh-Start Adjustment, Increase (Decrease), Accrued Liabilities Fresh-Start Adjustment, Increase (Decrease), Accrued Liabilities Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Liabilities, Current Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Liabilities, Current Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities Fresh-Start Adjustment, Increase (Decrease), Other Long-term Debt Fresh-Start Adjustment, Increase (Decrease), Other Long-term Debt Fresh-Start Adjustment, Increase (Decrease), Pension Obligations Fresh-Start Adjustment, Increase (Decrease), Pension Obligations Fresh-Start Adjustment, Increase (Decrease), Other Postretirement Obligations Fresh-Start Adjustment, Increase (Decrease), Other Postretirement Obligations Fresh-Start Adjustment, Increase (Decrease), Liabilities Fresh-Start Adjustment, Increase (Decrease), Liabilities Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract] Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity [Abstract] Fresh-Start Adjustment, Increase (Decrease), Common Stock Fresh-Start Adjustment, Increase (Decrease), Common Stock Fresh-Start Adjustment, Increase (Decrease), Additional Paid-in Capital Fresh-Start Adjustment, Increase (Decrease), Additional Paid-in Capital Fresh-Start Adjustment, Increase (Decrease), Treasury Stock Fresh-Start Adjustment, Increase (Decrease), Preferred and Common Stock Held in Treasury Fresh-Start Adjustment, Increase (Decrease), Retained Earnings (Deficit) Fresh-Start Adjustment, Increase (Decrease), Retained Earnings (Deficit) Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity Fresh-Start Adjustment, Increase (Decrease), Stockholders' Equity Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Two Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Three Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Four Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Amortization Expense, after Year Five Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Restructuring and Related Activities [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Cash Payable [Member] Cash Payable [Member] Cash Payable [Member] Severance [Member] Severance [Member] Severance [Member] Noncash [Member] Noncash [Member] Noncash [Member] Advisory Costs [Member] Advisory Costs [Member] Advisory Costs [Member] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Inventory Valuation Adjustments Inventory Write-down Non-production expenses Other Cost of Operating Revenue Site expenses Cost of Other Property Operating Expense Accelerated property, plant and equipment expenses Accelerated propery, plant and equipment expenses Accelerated propery, plant and equipment expenses Asset retirement charges Production Related Impairments or Charges Power contract losses Gain (Loss) on Sale of Commodity Contracts One-time termination benefit costs Payments for one-time termination benefits Payments for Restructuring DOE Share of Paducah Termination Benefit Costs DOE Share of Paducah Termination Benefit Costs DOE Share of Paducah Termination Benefit Costs Structuring advisory costs Other Restructuring Costs Restructuring Liability Balance Restructuring Liability Balance Restructuring Liability Balance Restructuring Charges Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Disclosure Items [Axis] Fair Value, Hierarchy [Axis] Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Disclosure Items [Domain] Fair Value Hierarchy [Domain] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Deferred compensation asset Cash Surrender Value, Fair Value Disclosure Deferred compensation obligation Obligations, Fair Value Disclosure Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Text Block] Transition Charges Restructuring and Related Activities Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Gain arising during period Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax Subsequent Events [Text Block] Subsequent Events [Text Block] Options excluded from diluted net income per share Options with exercise price greater than market price Options with exercise price greater than market price Warrants excluded from diluted net income per share Warrants with exercise price greater than market price Warrants with exercise price greater than market price Exercise price of excluded options Investment Options, Exercise Price Exercise price of excluded warrants Investment Warrants, Exercise Price Gain (Loss) on Disposition of Property Plant Equipment Gain (Loss) on Disposition of Property Plant Equipment Proceeds from Sale of Property, Plant, and Equipment Proceeds from Sale of Property, Plant, and Equipment Net (loss) from continuing operations Net (loss) from continuing operations - if converted Net income (loss) from continuing operations - if converted Net income (loss) from continuing operations - if converted Net income from discontinued operations - if converted Net income (loss) from discontinued operations - if converted Net income (loss) from discontinued operations - if converted Net (loss) - if converted Net Income (Loss) Attributable to Parent, Diluted Weighted average common shares Less: Weighted average unvested restricted stock Weighted Average Number of Shares, Restricted Stock Denominator for basic calculation Weighted Average Number of Shares Outstanding, Basic Convertible notes Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Convertible preferred stock - equivalent common shares Total Common Shares Attributable To Conversion Of Debt Securities Total Common Shares Attributable To Conversion Of Debt Securities Convertible preferred stock - less: share issuance limitation Unallowable Common Shares Attributable To Conversion Of Debt Securities Unallowable Common Shares Attributable To Conversion Of Debt Securities Convertible preferred stock - net allowable shares Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Subtotal Unadjusted weighted average effect of dilutive securities Unadjusted weighted average effect of dilutive securities Less: shares excluded in a period of net loss or antidilution Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Denominator for diluted calculation Income (Loss) from discontinued operations - per basic and diluted share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic and Diluted Share Provision (benefit) for income taxes Unrecognized tax benefits, period increase (decrease) Unrecognized Tax Benefits, Period Increase (Decrease) Pension and Postretirement Health and Life Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Accounts Payable, Other, Current Accounts Payable, Other, Current Compensation and Benefits Payable Compensation and Benefits Payable Compensation and Benefits Payable Accrued Severance Accrued Severance Accrued Severance Accrued Lease Turnover, Current Accrued Lease Turnover, Current Accrued Lease Turnover, Current Other Accrued Liabilities, Current Other Accrued Liabilities, Current Accounts Payable and Accrued Liabilities, Current Schedule of Stock-Based Compensation Costs Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Document and Entity Information Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus