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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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