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Commitment and Contingencies (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 6 Months Ended 9 Months Ended
Mar. 31, 2015
Sep. 30, 2014
ACTDO DOE Funding – Increment 1   $ 33.7
ACTDO DOE Funding – Exercised Contract Total   75.3
ACTDO DOE Funding – Monthly 6.9 6.7
ACTDO DOE Funding – Option 41.7  
ACTDO DOE Funding – Total 117  
Decontamination and Decommisioning Obligation, Noncurrent   22.6
Cash collateralized surety bonds   29.4
NYSE 30-day Average Minimum Market Capitalization   50
NYSE Minimum 30 Day Average Closing Price   $ 1.00
PBGC estimate of potential Portsmouth pension liability   $ 130