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Commitment and Contingencies (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2016 | Sep. 30, 2015
ACTDO DOE Funding – Monthly | $ 6.7 leu_ACTDODOEFundingMonthly |  |
Scenario, Forecast [Member] |  |  |
FY16 budget request for centrifuge program |  | 100 leu_FY16budgetrequestforcentrifugeprogram / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
FY16 House bill for direct appropriations for centrifuge program |  | 50 leu_FY16Housebillfordirectappropriationsforcentrifugeprogram / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
FY16 House bill for reprogramming authority for centrifuge program |  | 50 leu_FY16Housebillforreprogrammingauthorityforcentrifugeprogram / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember |
ACTDO DOE Funding – Monthly |  |  | $ 6.9 leu_ACTDODOEFundingMonthly / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

X
- Definition ACTDO DOE Funding – Monthly + References No definition available. + Details
Name: | leu_ACTDODOEFundingMonthly
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition FY16 budget request for centrifuge program + References No definition available. + Details
Name: | leu_FY16budgetrequestforcentrifugeprogram
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition FY16 House bill for direct appropriations for centrifuge program + References No definition available. + Details
Name: | leu_FY16Housebillfordirectappropriationsforcentrifugeprogram
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition FY16 House bill for reprogramming authority for centrifuge program + References No definition available. + Details
Name: | leu_FY16Housebillforreprogrammingauthorityforcentrifugeprogram
Namespace Prefix: | leu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |