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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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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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