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Document and Entity Information
Nov. 10, 2020
Cover [Abstract]  
Entity Registrant Name ACUITY BRANDS INC
Amendment Flag false
Entity Central Index Key 0001144215
Document Type 8-K
Document Period End Date Nov. 10, 2020
Entity Incorporation State Country Code DE
Entity File Number 001-16583
Entity Tax Identification Number 58-2632672
Entity Address, Address Line One 1170 Peachtree Street, N.E
Entity Address, Address Line Two Suite 2300
Entity Address, City or Town Atlanta
Entity Address, State or Province GA
Entity Address, Postal Zip Code 30309
City Area Code (404)
Local Phone Number 853-1400
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common stock, $0.01 par value per share
Trading Symbol AYI
Security Exchange Name NYSE
Entity Emerging Growth Company false