v3.26.1
Cover
Apr. 01, 2026
Cover [Abstract]  
Document Type 8-K
Document Period End Date May 20, 2026
Registrant Name JAMES HARDIE INDUSTRIES plc
Entity Incorporation, State or Country Code L2
Entity File Number 1-15240
Entity Tax Identification Number 98-0382260
Entity Address, Address Line One 1st Floor, Block A
Entity Address, Address Line Two One Park Place
Entity Address, Address Line Three Upper Hatch Street
Entity Address, City or Town Dublin 2
Entity Address, Postal Zip Code D02 FD79
Entity Address, Country IE
City Area Code 353
Local Phone Number 1411 6924
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Ordinary shares, 0.59 Euro par value per share
Trading Symbol JHX
Security Exchange Name NYSE
Entity Emerging Growth Company false
Amendment Flag false
Central Index Key 0001159152