v3.26.1
Cover page - shares
 6 Months Ended
Jun. 30, 2026
Jul. 31, 2026
Document Information [Line Items]    
Document Type 10-Q/A  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2026  
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 1720 Mt. Athos Road  
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 Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   91,621,980
Amendment Flag false  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001486957  
Current Fiscal Year End Date --12-31  
Former Address    
Document Information [Line Items]    
Entity Address, Address Line One 800 Main Street  
Entity Address, Address Line Two 4th Floor  
Entity Address, City or Town Lynchburg  
Entity Address, State or Province VA  
Entity Address, Postal Zip Code 24504