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Segment Reporting - Schedule of Revenue Information by Products and Service Lines (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Revenues from External Customers [Line Items]        
Revenues $ 764,039 $ 681,465 $ 1,446,297 $ 1,285,431
Operating Segments        
Revenues from External Customers [Line Items]        
Revenues 765,098 682,337 1,448,695 1,286,496
Operating Segments | Government Operations        
Revenues from External Customers [Line Items]        
Revenues 588,959 540,846 1,144,246 1,027,967
Operating Segments | Commercial Operations        
Revenues from External Customers [Line Items]        
Revenues 176,139 141,491 304,449 258,529
Operating Segments | Nuclear Components and Fuel | Government Operations        
Revenues from External Customers [Line Items]        
Revenues 428,552 422,023 869,631 796,278
Operating Segments | Uranium Processing and Nuclear Services | Government Operations        
Revenues from External Customers [Line Items]        
Revenues 121,690 67,215 204,855 133,628
Operating Segments | Advanced Reactor Design and Engineering | Government Operations        
Revenues from External Customers [Line Items]        
Revenues 38,717 51,608 69,760 98,061
Operating Segments | Nuclear Manufacturing | Commercial Operations        
Revenues from External Customers [Line Items]        
Revenues 104,775 70,591 190,985 131,529
Operating Segments | Nuclear Services and Engineering | Commercial Operations        
Revenues from External Customers [Line Items]        
Revenues 71,364 70,900 113,464 127,000
Eliminations        
Revenues from External Customers [Line Items]        
Revenues $ (1,059) $ (872) $ (2,398) $ (1,065)