Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Finite-Lived Intangible Assets [Table]
Schedule of Finite-Lived Intangible Assets [Table]
Scenario [Axis]
Scenario [Axis]
Scenario, Unspecified [Domain]
Scenario, Unspecified [Domain]
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
Intangible Assets, Net (Excluding Goodwill)
Average useful life of finite-lived intangible assets
Finite-Lived Intangible Asset, Useful Life
Statement of Cash Flows [Abstract]
Statement [Table]
Statement [Table]
Statement [Line Items]
Statement [Line Items]
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 loss
Defined Benefit Plan, Actuarial Gain (Loss)
Interest on paid-in-kind toggle notes
Paid-in-Kind Interest
Gain on early extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Gain on sale of assets
Gain (Loss) on Sale of Assets and Asset Impairment Charges
Inventory valuation adjustment
Other Noncash 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]
Capital expenditures
Payments to Acquire Property, Plant, and Equipment
Deposits for surety bonds - net (increase) decrease
Increase (Decrease) in Restricted Cash
Proceeds from sales of assets
Proceeds from Sale of Productive Assets
Net Cash Provided by (Used in) 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]
Repurchase of debt
Repayments of Debt
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 Carrying Value
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
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]
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Interest expense
Interest Expense, Debt
Inventory, Net [Abstract]
Schedule of Inventories
Schedule of Inventory, Current [Table Text Block]
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Pension and Postretirement Health and Life Benefits
Pension and Other Postretirement Benefits Disclosure [Text Block]
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
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]
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]
Other Postretirement Benefit Plan [Member]
Other Postretirement Benefit Plan [Member]
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, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets
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
Income (loss) before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Provision (benefit) for income taxes
Income Tax Expense (Benefit)
Net income (loss)
Net income (loss) per share - basic and diluted
Earnings Per Share, Basic and Diluted
Weighted-average number of shares outstanding:
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Weighted Average Number of Shares Outstanding, Basic and Diluted
Weighted Average Number of Shares Outstanding, Basic and Diluted
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
Inventory, Net
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
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.
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
Restructuring and Related Activities [Abstract]
Restructuring and Related Costs [Table Text Block]
Restructuring and Related Costs [Table Text Block]
Accounts Receivable, Net, Current [Abstract]
Schedule of Accounts Receivable
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Net Income (Loss) Per Share
Earnings Per Share [Text Block]
Segment Reporting Information, Revenue for Reportable Segment [Abstract]
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
Fair Value Disclosures [Abstract]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Disclosure Items [Axis]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Fair Value Hierarchy [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents
Deferred compensation asset
Cash Surrender Value, Fair Value Disclosure
Deferred compensation obligation
Obligations, Fair Value Disclosure
Fair Value Measurements, Recurring and Nonrecurring [Table]
Fair Value Measurements, Recurring and Nonrecurring [Table]
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Fair Value, Measurement Frequency [Domain]
Fair Value, Measurement Frequency [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]
Long-term debt, gross
Long-term Debt, Gross
Long-term debt, fair value
Long-term Debt, Fair Value
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]
Debt Disclosure [Abstract]
Debt
Debt Disclosure [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]
Weighted average common shares
Weighted Average Number of Shares Issued, Basic
Denominator for basic calculation
Weighted Average Number of Shares Outstanding, Basic
Denominator for diluted calculation
Net loss per share - basic and diluted
Share-based Compensation [Abstract]
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
Accounts Receivable
Loans, Notes, Trade and Other Receivables 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]
Accounts Receivable, Gross, Noncurrent
Accounts Receivable, Gross, Noncurrent
Accounts Receivable, Net, Noncurrent
Accounts Receivable, Net, Noncurrent
Other long-term liabilities
Other Liabilities, Noncurrent
Range [Axis]
Range [Axis]
Range [Domain]
Range [Domain]
Maximum [Member]
Maximum [Member]
Repurchase of debt
Extinguishment of Debt, Amount
Repurchase of debt, fair value
Debt Instrument, Repurchase Amount
Debt instrument interest rate
Debt Instrument, Interest Rate, Stated Percentage
Gain on early extinguishment of debt
Write off of deferred financing cost
Write off of Deferred Debt Issuance Cost
Debt Interest Rate, PIK
Debt Interest Rate, PIK
Debt Interest Rate, PIK
Paid-in-Kind Interest
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Segment Information
Segment Reporting Disclosure [Text Block]
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]
Accounts receivable, net
Accounts Receivable, Net, Current
Inventories
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
Deposits for surety bonds
Deposits Assets, Noncurrent
Intangible assets
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
Inventories owed to customers and suppliers
Deferred revenue
Deferred Revenue and Credits, Current
Decontamination and decommissioning obligations - current
Asset Retirement Obligation, 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
Decontamination and decommissioning obligations - long-term
Asset Retirement Obligations, Noncurrent
Total liabilities
Liabilities, Noncurrent
Commitments and contingencies (Note 12)
Commitments and Contingencies
Stockholders' Deficit
Stockholders' Equity Attributable to Parent [Abstract]
Common stock
Common Stock, Value, Issued
Excess of capital over par value
Additional Paid in Capital
Accumulated deficit
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive income (loss), net of tax
Accumulated Other Comprehensive Income (Loss), Net of Tax
Total stockholders' deficit
Stockholders' Equity Attributable to Parent
Total Liabilities and Stockholders’ Equity (Deficit)
Liabilities and Equity
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
Decline in Uranium Spot Price Indicator
Decline in Uranium Spot Price Indicator
Decline in Uranium Spot Price Indicator
Inventory write-down
Inventory Write-down
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment
Property, Plant and Equipment [Table Text Block]
Utility Customer Receivables
Utility Customer Receivables
Utility Customer Receivables
Contract Services Customer Receivables
Contract Services Customer Receivables
Contract Services Customer Receivables
Accounts Receivable, Net
Restructuring Type [Axis]
Restructuring Type [Axis]
Type of Restructuring [Domain]
Type of Restructuring [Domain]
Contract Reduction [Member]
Contract Termination [Member]
Minimum [Member]
Minimum [Member]
CFCAA funding threshold related to liability under ERISA
CFCAA funding threshold related to liability under ERISA
CFCAA funding threshold related to liability under ERISA
Decontamination and decommissioning obligations - total
Asset Retirement Obligation
D&D financial assurance
ARO financial assurance
ARO financial assurance
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]
Employee Stock Option [Member]
Employee Stock Option [Member]
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 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
Defined Benefit Plans and Other Postretirement Benefit Plans [Axis]
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Asset Categories [Axis]
Defined Benefit Plan, Asset Categories [Axis]
Plan Asset Categories [Domain]
Plan Asset Categories [Domain]
Industry Sector [Axis]
Industry Sector [Axis]
Industry Sector [Domain]
Industry Sector [Domain]
Equity Securities by Entity Size [Axis]
Equity Securities by Entity Size [Axis]
Equity Securities, Entity Size [Domain]
Equity Securities, Entity Size [Domain]
Equity Securities by Investment Objective [Axis]
Equity Securities by Investment Objective [Axis]
Equity Securities, Investment Objective [Domain]
Equity Securities, Investment Objective [Domain]
Fair Value, Hierarchy [Axis]
Fair Value Hierarchy [Domain]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Schedule of Net Benefit Costs
Schedule of Net Benefit Costs [Table Text Block]
Statement of Stockholders' Equity [Abstract]
Equity Components [Axis]
Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock Par Value $.10 per Share [Member]
Common Stock [Member]
Excess of Capital over Par Value [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
AOCI Attributable to Parent [Member]
Beginning Balance
Other comprehensive income, net of tax (Note 13)
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
Ending Balance
Inventories
Inventory Disclosure [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
Exercise price of excluded options
Investment Options, Exercise Price
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]
Land [Member]
Land [Member]
Leasehold Improvements [Member]
Leasehold Improvements [Member]
Equipment [Member]
Equipment [Member]
Other Capitalized Property Plant and Equipment [Member]
Other Capitalized Property Plant 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, Additions
Property, Plant and Equipment, Additions
Property, Plant and Equipment, Disposals
Property, Plant and Equipment, Disposals
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
Property, Plant And Equipment, Net Capital Expenditures
Property, Plant And Equipment, Net Capital Expenditures
Property, Plant And Equipment, Net Capital Expenditures
Property, Plant and Equipment, Net
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]
Contract Services and Advanced Technology Costs and Other Income
Research, Development, and Computer Software Disclosure [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]
Statement of Comprehensive Income [Abstract]
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
Comprehensive income (loss)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Segment Reporting Information
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Schedule of Financial Instruments Recorded at Fair Value
Fair Value, Measurement Inputs, Disclosure [Text Block]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Stock-Based Compensation
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Special Charges
Restructuring and Related Activities Disclosure [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
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
Schedule of Debt [Table Text Block]
Schedule of Debt [Table Text Block]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Other Restructuring [Member]
Other Restructuring [Member]
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
Payments for one-time termination benefits
Payments for Restructuring
Restructuring liability
Restructuring Reserve
Postretirement Health and Life Benefits Plans [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
Actuarial (gain) loss from remeasurement, net
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
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 increase for paid and accrued PIK interest
Debt Instrument, Increase (Decrease), Other, Net
Repurchase of debt
Write off of deferred financing cost
Deferred financing costs
Debt Issuance Costs, Noncurrent, Net
Intangible Assets
Goodwill and Intangible Assets Disclosure [Text Block]
Customer [Axis]
Customer [Axis]
Customer [Domain]
Customer [Domain]
2017 ORNL Contract [Member]
2017 ORNL Contract [Member]
2017 ORNL Contract [Member]
2016 ORNL Contract [Member]
2016 ORNL Contract [Member]
2016 ORNL Contract [Member]
2015 ORNL Contract [Member]
2015 ORNL Contract1 [Member]
2015 ORNL Contract1 [Member]
Scenario, Forecast [Member]
Scenario, Forecast [Member]
Contract value
2017 ORNL Contract value
2017 ORNL Contract value
Contract monthly revenue
UT-Battelle contract monthly revenue
UT-Battelle contract monthly revenue
Contract milestone payments
Contract milestone payments
Contract milestone payments
Contract revenue current work
UT-Battelle contract revenue current work
UT-Battelle contract revenue current work
Contract revenue past work
UT-Battelle contract revenue past work
UT-Battelle contract revenue past work
D&D Expense
Environmental Remediation Expense
Property, Plant and Equipment
Property, Plant and Equipment Disclosure [Text Block]
Termination benefit costs
Other Restructuring Costs
Other Restructuring Costs
Payments for Tenant Improvements
Payments for Tenant Improvements