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Cover - USD ($)
$ in Billions
 12 Months Ended
Dec. 31, 2022
Feb. 21, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-34658    
Entity Registrant Name BWX TECHNOLOGIES, INC.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 80-0558025    
Entity Address, Address Line One 800 Main Street, 4th Floor    
Entity Address, City or Town Lynchburg,    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 24504    
City Area Code 980    
Local Phone Number 365-4300    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol BWXT    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 5.0
Entity Common Stock, Shares Outstanding   91,282,718  
Documents Incorporated by Reference Portions of the registrant's definitive proxy statement for the 2023 Annual Meeting of Stockholders to be held on May 3, 2023 are incorporated by reference into Part III of this Form 10-K.    
Amendment Flag false    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Entity Central Index Key 0001486957    
Document Type 10-K