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Commitment and Contingencies (Details) (USD $)
 7 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2016
ACTDO DOE Funding – Monthly $ 6,900,000leu_ACTDODOEFundingMonthly $ 6,700,000leu_ACTDODOEFundingMonthly      
Liability for decontamination and decommissioning     22,600,000us-gaap_AssetRetirementObligation    
D&D financial assurance     29,400,000leu_AROfinancialassurance    
Accrued liabilities for stored wastes     1,000,000leu_Accruedliabilitiesforstoredwastes 1,800,000leu_Accruedliabilitiesforstoredwastes  
Accrued lease turnover - Portsmouth, current     2,600,000leu_AccruedleaseturnoverPortsmouthcurrent 5,500,000leu_AccruedleaseturnoverPortsmouthcurrent  
Operating Leases, Rent Expense     7,000,000us-gaap_LeaseAndRentalExpense 7,100,000us-gaap_LeaseAndRentalExpense  
Scenario, Forecast [Member]          
FY16 budget request for centrifuge program         100,000,000leu_FY16budgetrequestforcentrifugeprogram
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Minimum [Member]          
ACP Sales Royalty Rate     1.00%leu_ACPSalesRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
ACP Sales Royalty     100,000leu_ACPSalesRoyalty
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		    
Maximum [Member]          
ACP Sales Royalty Rate     2.00%leu_ACPSalesRoyaltyRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		    
ACP Sales Royalty     $ 100,000,000leu_ACPSalesRoyalty
/ us-gaap_RangeAxis
= us-gaap_MaximumMember