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Segment Reporting - Schedule of Income Before Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Nov. 30, 2024 | Nov. 30, 2023
Segment Reporting Information [Line Items] |  |
Operating profit | $ 133.3 | $ 132.9
Interest (income) expense, net | (4.0) | 0.9
Miscellaneous expense, net | 2.5 | 1.1
Income before income taxes | 134.8 | 130.9
Operating Segments | Acuity Brands Lighting |  |
Segment Reporting Information [Line Items] |  |
Operating profit | 143.3 | 143.8
Operating Segments | Acuity Intelligent Spaces |  |
Segment Reporting Information [Line Items] |  |
Operating profit | 10.8 | 5.3
Unallocated corporate amounts |  |
Segment Reporting Information [Line Items] |  |
Operating profit | $ (20.8) | $ (16.2)

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