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Cover
Feb. 08, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Feb. 08, 2021
Entity File Number 0-52423
Entity Registrant Name AECOM
Entity Central Index Key 0000868857
Entity Tax Identification Number 61-1088522
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 300 South Grand Avenue
Entity Address, Address Line Two 9th Floor
Entity Address, City or Town Los Angeles
Entity Address, State or Province CA
Entity Address, Postal Zip Code 90071
City Area Code 213
Local Phone Number 593-8000
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 ACM
Security Exchange Name NYSE
Entity Emerging Growth Company false