XML 5 R1.htm IDEA: XBRL DOCUMENT v3.22.2.2
Document and Entity Information
Dec. 06, 2022
Nov. 03, 2021
Cover [Abstract]    
Document Type 8-K  
Amendment Flag false  
Document Period End Date Dec. 12, 2022  
Entity Registrant Name CompX International Inc.  
Entity Incorporation, State or Country Code DE  
Securities Act File Number 1-13905  
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
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  
Trading Symbol CIX  
Security Exchange Name NYSEAMER