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Document and Entity Information
Jun. 06, 2023
Cover [Abstract]  
Entity Registrant Name ATI INC
Amendment Flag false
Entity Central Index Key 0001018963
Document Type 8-K
Document Period End Date Jun. 06, 2023
Entity Incorporation State Country Code DE
Entity File Number 1-12001
Entity Tax Identification Number 25-1792394
Entity Address, Address Line One 2021 McKinney Avenue
Entity Address, City or Town Dallas
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75201
City Area Code (800)
Local Phone Number 289-7454
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, par value $0.10 per share
Trading Symbol ATI
Security Exchange Name NYSE
Entity Emerging Growth Company false