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Segment Reporting - Schedule of Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Segment Reporting Information [Line Items]
Operating profit	$ 110.2	$ 118.1	$ 243.5	$ 251.0
Interest expense (income), net	6.9	(0.1)	2.9	0.8
Miscellaneous expense, net	1.0	0.6	3.5	1.7
Income before income taxes	102.3	117.6	237.1	248.5
Operating Segments | Acuity Brands Lighting
Segment Reporting Information [Line Items]
Operating profit	130.3	126.0	273.6	269.8
Operating Segments | Acuity Intelligent Spaces
Segment Reporting Information [Line Items]
Operating profit	9.9	9.1	20.7	14.4
Unallocated corporate amounts
Segment Reporting Information [Line Items]
Operating profit	$ (30.0)	$ (17.0)	$ (50.8)	$ (33.2)

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