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] Pension Plan, Defined Benefit [Member] Pension Plan [Member] Postretirement Health and Life Benefits Plans [Member] Other Postretirement Benefit Plan [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Successor [Member] Successor [Member] Predecessor [Member] Predecessor [Member] Statement [Line Items] Statement [Line Items] 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) Actuarial (gain) loss from remeasurement, net Defined Benefit Plan, Actuarial Gain (Loss) Curtailment (gain) Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments Amortization of prior service costs (credits), net Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Earnings Per Share [Abstract] Statement [Table] Statement [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] 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 Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Axis] Lease Arrangement, Type [Domain] Lease Arrangement, Type [Domain] Corporate Headquarters [Member] Corporate Headquarters [Member] Corporate Headquarters [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Operating leases, future minimum payments due, 2016 Operating Leases, Future Minimum Payments Due, Next Twelve Months Operating leases, future minimum payments due, 2017 Operating Leases, Future Minimum Payments, Due in Two Years Operating leases, future minimum payments due, 2018 Operating Leases, Future Minimum Payments, Due in Three Years Operating leases, future minimum payments due, 2019 Operating Leases, Future Minimum Payments, Due in Four Years Operating leases, future minimum payments due, 2020 Operating Leases, Future Minimum Payments, Due in Five Years Operating leases, future minimum payments due, thereafter Operating Leases, Future Minimum Payments, Due Thereafter Operating leases, future minimum payments due Operating Leases, Future Minimum Payments Due Document and Entity Information Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol 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 Goodwill and Intangible Assets Disclosure [Abstract] Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of Sales [Member] Cost of Sales [Member] Selling, General and Administrative Expenses [Member] Selling, General and Administrative Expenses [Member] Other Postretirement Benefit Plan, Defined Benefit [Member] Scenario, Forecast [Member] Scenario, Forecast [Member] Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Contributions by Employer Expected defined benefit plan contributions for next fiscal year for non-qualified plans Expected defined benefit plan contributions for next fiscal year for non-qualified plans Expected defined benefit plan contributions for next fiscal year for non-qualified plans Defined Benefit Plan, Lump Sum Benefits Paid Defined Benefit Plan, Lump Sum Benefits Paid Defined Benefit Plan, Lump Sum Benefits Paid Actuarial (gain) loss from remeasurement, net Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Defined Benefit Plan, Expected Return on Plan Assets Fair Value Disclosures [Abstract] 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] Deferred compensation asset Cash Surrender Value, Fair Value Disclosure Deferred compensation obligation Obligations, Fair Value Disclosure Statement of Financial Position [Abstract] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net 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 SWU purchase agreements Accounts Payable, Current Deferred 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 Total current liabilities Liabilities, Current Long-term debt Long-term Debt Postretirement health and life benefit obligations Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent Pension benefit liabilities Defined Benefit Pension Plan, Liabilities, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Total liabilities Liabilities, Noncurrent Commitments and contingencies (Note 13) Commitments and Contingencies Total stockholders’ equity (deficit) Stockholders' Equity Attributable to Parent Total Liabilities and Stockholders’ Equity (Deficit) Liabilities and Equity Accounts Receivable, Net, Current [Abstract] Utility Customer Receivables Utility Customer Receivables Utility Customer Receivables Contract Services Customer Receivables Contract Services Customer Receivables Contract Services Customer Receivables Accounts Receivable, Net Inventory, Net [Abstract] Schedule of Inventories Schedule of Inventory, Current [Table Text Block] Share-based Compensation [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) [Member] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Employee Stock Option [Member] Employee Stock Option [Member] Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average period in years of costs to be recognized Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Schedule of Net Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Restricted Stock or Unit Expense Restricted Stock or Unit Expense Stock or Unit Option Plan Expense Stock or Unit Option Plan Expense Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Restructuring and Related Activities [Abstract] Special Charges Summary [Table Text Block] Restructuring and Related Costs [Table Text Block] Accounts Receivable Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Pension and Postretirement Health and Life Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Contract Reduction [Member] Contract Termination [Member] Other Restructuring [Member] Other Restructuring [Member] Direct charges Other Cost of Operating Revenue Operating expenses Cost of Other Property Operating Expense Inventory valuation adjustments Inventory Write-down Plant asset depreciation charges Cost of Goods Sold, Depreciation Termination benefit costs Severance Costs DOE Share of Paducah Termination Benefit Costs DOE Share of Paducah Termination Benefit Costs DOE Share of Paducah Termination Benefit Costs Schedule of Financial Instruments Recorded at Fair Value Fair Value, Measurement Inputs, Disclosure [Text Block] ACTDO DOE Funding – Monthly ACTDO DOE Funding – Monthly ACTDO DOE Funding – Monthly ACTDO DOE Funding ACTDO DOE Funding ACTDO DOE Funding ACTDO DOE Funding Reduction ACTDO DOE Funding Reduction ACTDO DOE Funding Reduction PBGC preliminary estimate of ERISA liability PBGC preliminary estimate of ERISA liability After receiving the Company’s notification of the transition of employees at the Portsmouth GDP in 2011, the PBGC staff at that time informally advised Enrichment Corp. of its preliminary view that the Portsmouth GDP transition was a cessation of operations that triggered liability under ERISA Section 4062(e) and that its preliminary estimate was that the ERISA Section 4062(e) liability (computed taking into account the plan’s underfunding on a “termination basis,” which amount differs from that computed for GAAP purposes) for the Portsmouth GDP transition was approximately $130 million. PBGC threshold for reduction in active plan participants PBGC threshold for reduction in active plan participants PBGC threshold for reduction in active plan participants CFCAA funding threshold related to liability under ERISA CFCAA funding threshold related to liability under ERISA CFCAA funding threshold related to liability under ERISA Liability for decontamination and decommissioning Asset Retirement Obligation ARO financial assurance ARO financial assurance ARO financial assurance Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] Accumulated Other Comprehensive Income (Loss) Comprehensive Income (Loss) Note [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment 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 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 Plan of Reorganization Acceptance Rate Plan of Reorganization Acceptance Rate Plan of Reorganization Acceptance Rate Debt Disclosure [Abstract] Debt instrument interest rate Debt Instrument, Interest Rate, Stated Percentage Debt Interest Rate, PIK Debt Interest Rate, PIK Debt Interest Rate, PIK Paid-in-Kind Interest Paid-in-Kind Interest Interest Paid Interest Paid Deferred Finance Costs, End Balance Deferred Finance Costs, Noncurrent, Net Statement of Cash Flows [Abstract] Cash Flows from Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Net income (loss) Net Income (Loss) Attributable to Parent 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 Immediate recognition of net actuarial losses Interest on paid-in-kind toggle notes Gain on sale of assets Gain (Loss) on Sale of Assets and Asset Impairment Charges Non-cash reorganization items Other Noncash Income (Expense) 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 SWU purchase agreements – increase (decrease) Increase (Decrease) in Accounts Payable, Trade Deferred revenue, net of deferred costs – increase (decrease) Increase (Decrease) in Deferred Revenue 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 Proceeds from Sale of Productive Assets Capital expenditures Payments to Acquire Productive Assets 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] Payments for deferred financing costs Payments of 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 Conversion of interest payable-in-kind to long-term debt Notes Issued Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Income Statement [Abstract] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] 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. Uranium [Member] Uranium [Member] Uranium [Member] - Natural uranium or the uranium component of Low Enriched Uranium (LEU). Revenue: Revenues [Abstract] Revenue, Goods Sales Revenue, Goods, Net Contract services Contracts Revenue Total Revenue Revenues 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 Advanced technology costs Research and Development Expense Selling, general and administrative Selling, General and Administrative Expense Amortization of intangible assets Amortization of Intangible Assets Special charges for workforce reductions Restructuring Charges Other (income) Other Operating Income Operating (loss) Operating Income (Loss) Interest (income) Investment Income, Interest Reorganization items, net Debtor Reorganization Items, Other Expense (Income) Income (loss) 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) Net income (loss) Net income (loss) per share - basic Earnings Per Share, Basic Net income (loss) per share - diluted 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 Outstanding, Basic Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Inventories Inventory Disclosure [Text Block] Transition Charges Restructuring and Related Activities Disclosure [Text Block] 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 Schedule of Accounts Receivable Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Statement of Comprehensive Income [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Curtailment (gain) recognized in net income (loss) 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, Attributable to Parent Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Income Per Share [Table] Schedule of Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Table] Income Per Share Calculation [Line Items] Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] Interest expense on convertible notes Net income (loss), if converted - diluted Net Income (Loss) Attributable to Parent, Diluted Weighted average common shares Weighted Average Number of Shares Issued, Basic Less: Weighted average unvested restricted stock Weighted Average Number of Shares, Restricted Stock Denominator for basic calculation 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 Weighted average effect of dilutive securities Weighted Average Number Diluted Shares Outstanding Adjustment Weighted Average Number of Shares Outstanding, Basic and Diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Debt Debt Disclosure [Text Block] 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] Government [Member] Government [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Valuation allowance and allowance for doubtful accounts Allowance for Doubtful Accounts Receivable Accounts Receivable, Gross, Noncurrent Accounts Receivable, Gross, Noncurrent Accounts Receivable, Net, Noncurrent Accounts Receivable, Net, Noncurrent Restructuring liability Restructuring Reserve Payments for one-time termination benefits Payments for Restructuring Restructuring liability DOE Share of Paducah Termination Benefit Costs Special charges for workforce reductions Long-term debt, fair value Long-term Debt, Fair Value Segment Reporting Information, Revenue for Reportable Segment [Abstract] Segment Reporting Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Share-based Goods and Nonemployee Services Transaction, Valuation Method, Risk Free Interest Rate Share-based Goods and Nonemployee Services Transaction, Valuation Method, Risk Free Interest Rate Share-based Goods and Nonemployee Services Transaction, Valuation Method, Expected Volatility Rate Share-based Goods and Nonemployee Services Transaction, Valuation Method, Expected Volatility Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Simplified Method Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term, Simplified Method Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 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 14) 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 Surrender of restricted stock Restricted Stock Award, Forfeitures 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 Ending Balance 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] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Research and Development [Abstract] Maximum RD&D Program Funding by DOE Maximum RD&D Program Funding by DOE Maximum RD&D Program Funding by DOE RD&D Program Funding by DOE RD&D Program Funding by DOE RD&D Program Funding by DOE Other advanced technology costs Other Research and Development Expense Property, Plant and Equipment Property, Plant and Equipment Disclosure [Text Block] 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] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Amortizable intangible assets, gross Intangible Assets, Gross (Excluding Goodwill) Accumulated intangible asset amortization Finite-Lived Intangible Assets, Accumulated Amortization Amortizable intangible assets, net Average useful life of finite-lived intangible assets Finite-Lived Intangible Asset, Useful Life Segment Information Segment Reporting Disclosure [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 Intangible Assets and Excess Reorganization Value [Table Text Block] Advanced Technology Costs and Other Income Research, Development, and Computer Software Disclosure [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Low Enriched Uranium Segment [Member] Low Enriched Uranium Segment [Member] Low Enriched Uranium Segment [Member] Contract Services Segment [Member] Contract Services Segment [Member] Contract Services Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues [Abstract] Revenue, Contract Services Gross Profit Net Income (Loss) Per Share Earnings Per Share [Text Block]