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Share-based Payments - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 01, 2020 | Jan. 31, 2020 | Nov. 30, 2020 | Feb. 29, 2020 | Nov. 30, 2019 | Sep. 30, 2020 | Aug. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options outstanding (shares) |  |  | 1,192,000 |  |  |  |
Restricted Stock and Performance Share Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Minimum age for eligibility under retirement vesting provision |  |  |  |  |  | 60 years |
Minimum service period under retirement vesting provision |  |  |  |  |  | 10 years |
Market Options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award expiration period |  | 10 years |  |  |  |  |
Duration of trailing average stock price |  |  |  | 12 months |  |  |
Amended and Restated Acuity Brand, Inc. 2012 Omnibus Stock Compensation Incentive Plan | Stock options |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options outstanding (shares) |  |  | 1,200,000 |  |  |  | 900,000
Options granted (shares) | 277,000 |  | 300,000 |  |  |  |
Shares issued from options exercised in period (shares) |  |  | 0 |  | 0 |  |
Intrinsic value of options outstanding |  |  | $ 7.5 |  |  |  |
Intrinsic value of options expected to vest |  |  | 2.9 |  |  |  |
Intrinsic value of options exercisable |  |  | 4.5 |  |  |  |
Unrecognized compensation cost |  |  | $ 23.6 |  |  |  |
Recognition period for unrecognized compensation cost |  |  | 2 years 6 months |  |  |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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