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Document and Entity Information
Aug. 09, 2022
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Aug. 09, 2022
Entity File Number 1-13905
Entity Registrant Name CompX International Inc.
Entity Central Index Key 0001049606
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 57-0981653
Entity Address, Address Line One 5430 LBJ Freeway
Entity Address, Address Line Two Suite 1700
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75240-2620
City Area Code 972
Local Phone Number 448-1400
Entity Emerging Growth Company false
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol CIX
Security Exchange Name NYSEAMER