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Share-based Payments - Stock Option Activity (Details) - $ / shares		3 Months Ended
	Sep. 01, 2020	Nov. 30, 2020	Aug. 31, 2020
Number of Shares (in millions)
Outstanding at end of period (shares)		1,192,000
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)	900,000	900,000
Granted (shares)	277,000	300,000
Canceled (shares)		0
Outstanding at end of period (shares)		1,200,000
Weighted Average Exercise Price
Outstanding at beginning of period (in usd per share)	$ 133.19	$ 133.19
Granted (in usd per share)		108.96
Canceled (in usd per share)		0
Outstanding at end of period (in usd per share)		$ 127.56
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Number of exercisable shares (shares)		400,000	400,000
Weighted average exercise price of exercisable shares (in usd per share)		$ 148.90	$ 151.07
$40.01 - $100.00 (average life - 1.9 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		1 year 10 months 24 days
Number of shares outstanding (shares)		100,000
Weighted average exercise price (in usd per share)		$ 62.25
Number of exercisable shares (shares)		100,000
Weighted average exercise price of exercisable shares (in usd per share)		$ 62.25
$100.01 - $160.00 (average life - 8.6 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)		100.01
Upper range of option exercise prices (in usd per share)		$ 160.00
Average life		8 years 7 months 6 days
Number of shares outstanding (shares)		1,000,000.0
Weighted average exercise price (in usd per share)		$ 119.11
Number of exercisable shares (shares)		200,000
Weighted average exercise price of exercisable shares (in usd per share)		$ 126.85
$160.01 - $210.00 (average life - 4.9 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		4 years 10 months 24 days
Number of shares outstanding (shares)		100,000
Weighted average exercise price (in usd per share)		$ 207.80
Number of exercisable shares (shares)		100,000
Weighted average exercise price of exercisable shares (in usd per share)		$ 207.80
$210.01 - $239.76 (average life - 5.9 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		5 years 10 months 24 days
Number of shares outstanding (shares)		0
Weighted average exercise price (in usd per share)		$ 239.76
Number of exercisable shares (shares)		0
Weighted average exercise price of exercisable shares (in usd per share)		$ 239.76

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