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Label	Element	Value
Lessee, Operating Lease, Liability, To Be Paid, After Year Four	ayi_LesseeOperatingLeaseLiabilityToBePaidAfterYearFour	$ 18,400,000
Standard Product Warranty Period	ayi_StandardProductWarrantyPeriod	5 years
Business Combination, Acquired Entity, Number of Lighting Brands	ayi_BusinessCombinationAcquiredEntityNumberofLightingBrands	5
Share-based Compensation Arrangement by Share-based Payment Award, Retirement Vesting Provision, Service Period	ayi_SharebasedCompensationArrangementbySharebasedPaymentAwardRetirementVestingProvisionServicePeriod	10 years
Debt Instrument, Periodic Payment, Maturity, Percent of Principal	ayi_DebtInstrumentPeriodicPaymentMaturityPercentofPrincipal	2.50%
Debt Instrument, Periodic Payment, Maturity, Percent of Principal	ayi_DebtInstrumentPeriodicPaymentMaturityPercentofPrincipal	2.50%
Debt Instrument, Periodic Payment, Maturity, Percent of Principal	ayi_DebtInstrumentPeriodicPaymentMaturityPercentofPrincipal	5.00%
Debt Instrument, Periodic Payment, Maturity, Percent of Principal	ayi_DebtInstrumentPeriodicPaymentMaturityPercentofPrincipal	5.00%
Debt Instrument, Periodic Payment, Maturity, Percent of Principal	ayi_DebtInstrumentPeriodicPaymentMaturityPercentofPrincipal	7.50%
Intangible Asset Impairment, Measurement Input	ayi_IntangibleAssetImpairmentMeasurementInput	3.00%
Intangible Asset Impairment, Measurement Input	ayi_IntangibleAssetImpairmentMeasurementInput	1.00%
Intangible Asset Impairment, Measurement Input	ayi_IntangibleAssetImpairmentMeasurementInput	4.00%
Intangible Asset Impairment, Measurement Input	ayi_IntangibleAssetImpairmentMeasurementInput	10.00%
Intangible Asset Impairment, Measurement Input	ayi_IntangibleAssetImpairmentMeasurementInput	13.00%
Standard Product Warranty Accrual, Increase (Decrease) for New Accounting Pronouncements	ayi_StandardProductWarrantyAccrualIncreaseDecreaseforNewAccountingPronouncements	$ 0
Standard Product Warranty Accrual, Increase (Decrease) for New Accounting Pronouncements	ayi_StandardProductWarrantyAccrualIncreaseDecreaseforNewAccountingPronouncements	$ (14,800,000)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Trailing Average Stock Price, Duration	ayi_SharebasedCompensationArrangementbySharebasedPaymentAwardFairValueAssumptionsTrailingAverageStockPriceDuration	12 months
Number of Unimpaired Intangible Assets	ayi_NumberofUnimpairedIntangibleAssets	12
Debt Instrument, Borrowing Period, Number of Installments	ayi_DebtInstrumentBorrowingPeriodNumberofInstallments	4
Line of Credit Facility, Covenant Terms, Interest Coverage Ratio, Minimum	ayi_LineOfCreditFacilityCovenantTermsInterestCoverageRatioMinimum	2.50
Share-based Compensation Arrangement by Share-based Payment Award, Retirement Vesting Provision, Award Requisite Age	ayi_SharebasedCompensationArrangementbySharebasedPaymentAwardRetirementVestingProvisionAwardRequisiteAge	60 years
Number of Intangible Assets	ayi_NumberofIntangibleAssets	13
Line of Credit Facility, Covenant Terms, Leverage Ratio, Maximum	ayi_LineOfCreditFacilityCovenantTermsLeverageRatioMaximum	3.50
Number of Impaired Intangible Assets	ayi_NumberofImpairedIntangibleAssets	1

Cover Page - shares	9 Months Ended
Cover Page - shares	May 31, 2020	Jun. 26, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	May 31, 2020
Document Transition Report	false
Entity File Number	001-16583
Entity Registrant Name	ACUITY BRANDS, INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common stock, $0.01 par value per share
Trading Symbol	AYI
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		39,637,386
Entity Central Index Key	0001144215
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--08-31

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