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Segment Reporting - Schedule of Revenue Information by Products and Service Lines (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer [Line Items]
Revenues	$ 725,515	$ 589,989	$ 612,445	$ 568,360	$ 624,177	$ 523,711	$ 554,208	$ 530,738	$ 2,496,309	$ 2,232,834	$ 2,124,074
Reportable Segments
Revenue from External Customer [Line Items]
Revenues									2,497,681	2,235,841	2,132,179
Reportable Segments | Government Operations
Revenue from External Customer [Line Items]
Revenues									2,031,337	1,808,483	1,725,097
Reportable Segments | Government Operations | Nuclear Components and Fuel
Revenue from External Customer [Line Items]
Revenues									1,610,183	1,494,810	1,481,416
Reportable Segments | Government Operations | Uranium Processing and Nuclear Services
Revenue from External Customer [Line Items]
Revenues									276,690	233,197	198,420
Reportable Segments | Government Operations | Advanced Reactor Design and Engineering
Revenue from External Customer [Line Items]
Revenues									144,464	80,476	45,261
Reportable Segments | Commercial Operations
Revenue from External Customer [Line Items]
Revenues									466,344	427,358	407,082
Reportable Segments | Commercial Operations | Nuclear Manufacturing
Revenue from External Customer [Line Items]
Revenues									231,944	221,458	246,444
Reportable Segments | Commercial Operations | Nuclear Services and Engineering
Revenue from External Customer [Line Items]
Revenues									234,400	205,900	160,638
Eliminations
Revenue from External Customer [Line Items]
Revenues									$ (1,372)	$ (3,007)	$ (8,105)

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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