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Document and Entity Information
May 06, 2025
Document and Entity Information [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date May 06, 2025
Entity Registrant Name CompX International Inc.
Entity Incorporation, State or Country Code DE
Entity File Number 1-13905
Entity Tax Identification Number 57-0981653
Entity Address, Address Line One 5430 LBJ Freeway
Entity Address, Adress 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
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Entity Central Index Key 0001049606
Title of 12(b) Security Class A common stock