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Revenue - Schedule of Disaggregated Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Disaggregation of Revenue [Line Items]
Total sales	$ 1,006.3	$ 905.9	$ 1,957.9	$ 1,840.6
Operating Segments | Acuity Brands Lighting
Disaggregation of Revenue [Line Items]
Total sales	840.6	843.5	1,726.6	1,719.9
Operating Segments | Acuity Intelligent Spaces
Disaggregation of Revenue [Line Items]
Total sales	171.5	68.1	245.0	132.3
Operating Segments | Independent sales network | Acuity Brands Lighting
Disaggregation of Revenue [Line Items]
Total sales	615.2	612.3	1,259.1	1,237.5
Operating Segments | Direct sales network | Acuity Brands Lighting
Disaggregation of Revenue [Line Items]
Total sales	97.4	93.0	204.6	190.4
Operating Segments | Retail sales | Acuity Brands Lighting
Disaggregation of Revenue [Line Items]
Total sales	41.0	46.4	85.9	102.0
Operating Segments | Corporate accounts | Acuity Brands Lighting
Disaggregation of Revenue [Line Items]
Total sales	35.6	38.1	68.3	79.6
Operating Segments | OEM and other | Acuity Brands Lighting
Disaggregation of Revenue [Line Items]
Total sales	51.4	53.7	108.7	110.4
Eliminations
Disaggregation of Revenue [Line Items]
Total sales	$ (5.8)	$ (5.7)	$ (13.7)	$ (11.6)

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