Cover
Oct. 14, 2020
Cover [Abstract]  
Document Type 8-K
Document Period End Date Oct. 14, 2020
Entity Registrant Name Commercial Metals Company
Entity Incorporation, State or Country Code DE
Entity File Number 1-4304
Entity Tax Identification Number 75-0725338
Entity Address, Address Line One 6565 N. MacArthur Blvd.
Entity Address, City or Town Irving
Entity Address, State or Province TX
Entity Address, Postal Zip Code 75039
City Area Code 214
Local Phone Number 689-4300
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol CMC
Security Exchange Name NYSE
Entity Emerging Growth Company false
Entity Central Index Key 0000022444
Amendment Flag false