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Cover
Nov. 04, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 04, 2021
Entity File Number 001-34658
Entity Registrant Name BWX TECHNOLOGIES, INC.
Entity Central Index Key 0001486957
Entity Tax Identification Number 80-0558025
Entity Incorporation, State or Country Code DE
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
City Area Code 980
Local Phone Number 365-4300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol BWXT
Security Exchange Name NYSE
Entity Emerging Growth Company false