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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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