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Share-based Payments - Stock Option Activity (Details) - $ / shares	3 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2020	May 31, 2020	Aug. 31, 2019
Number of Shares (in millions)
Outstanding at end of period (shares)	917,000	917,000
Stock options | Amended and Restated Acuity Brand, Inc. 2012 Omnibus Stock Compensation Incentive Plan
Number of Shares (in millions)
Outstanding at beginning of period (shares)		400,000
Granted (shares)	0	500,000
Exercised (shares)		(522)	0
Canceled (shares)		0
Outstanding at end of period (shares)	900,000	900,000	400,000
Weighted Average Exercise Price
Outstanding at beginning of period (in usd per share)		$ 146.70
Granted (in usd per share)		121.87
Exercised (in usd per share)		116.36
Canceled (in usd per share)		0
Outstanding at end of period (in usd per share)	$ 133.18	$ 133.18	$ 146.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of exercisable shares (shares)	400,000	400,000	300,000
Weighted average exercise price of exercisable shares (in usd per share)	$ 151.07	$ 151.07	$ 147.51
$40.01 - $100.00 (average life - 2.6 years) | Amended and Restated Acuity Brand, Inc. 2012 Omnibus Stock Compensation Incentive Plan
Share-based Payment Arrangement, Option, Exercise Price Range, Beginning of Period [Abstract]
Lower range of option exercise prices (in usd per share)		40.01
Upper range of option exercise prices (in usd per share)		$ 100.00
Average life		2 years 7 months 6 days
Number of shares outstanding (shares)	100,000	100,000
Weighted average exercise price (in usd per share)	$ 62.25	$ 62.25
Number of exercisable shares (shares)	100,000	100,000
Weighted average exercise price of exercisable shares (in usd per share)	$ 62.25	$ 62.25
$100.01 - $160.00 (average life - 8.8 years) | Amended and Restated Acuity Brand, Inc. 2012 Omnibus Stock Compensation Incentive Plan
Share-based Payment Arrangement, Option, Exercise Price Range, Beginning of Period [Abstract]
Lower range of option exercise prices (in usd per share)		100.01
Upper range of option exercise prices (in usd per share)		$ 160.00
Average life		8 years 9 months 18 days
Number of shares outstanding (shares)	700,000	700,000
Weighted average exercise price (in usd per share)	$ 123.02	$ 123.02
Number of exercisable shares (shares)	200,000	200,000
Weighted average exercise price of exercisable shares (in usd per share)	$ 126.16	$ 126.16
$160.01 - $210.00 (average life - 5.7 years) | Amended and Restated Acuity Brand, Inc. 2012 Omnibus Stock Compensation Incentive Plan
Share-based Payment Arrangement, Option, Exercise Price Range, Beginning of Period [Abstract]
Lower range of option exercise prices (in usd per share)		160.01
Upper range of option exercise prices (in usd per share)		$ 210.00
Average life		5 years 8 months 12 days
Number of shares outstanding (shares)	100,000	100,000
Weighted average exercise price (in usd per share)	$ 207.80	$ 207.80
Number of exercisable shares (shares)	100,000	100,000
Weighted average exercise price of exercisable shares (in usd per share)	$ 207.80	$ 207.80
$210.01 - $239.76 (average life - 6.7 years) | Amended and Restated Acuity Brand, Inc. 2012 Omnibus Stock Compensation Incentive Plan
Share-based Payment Arrangement, Option, Exercise Price Range, Beginning of Period [Abstract]
Lower range of option exercise prices (in usd per share)		210.01
Upper range of option exercise prices (in usd per share)		$ 239.76
Average life		6 years 8 months 12 days
Number of shares outstanding (shares)	0	0
Weighted average exercise price (in usd per share)	$ 239.76	$ 239.76
Number of exercisable shares (shares)	0	0
Weighted average exercise price of exercisable shares (in usd per share)	$ 239.76	$ 239.76

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