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Segment Information - Schedule of Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended
	Nov. 30, 2024	Nov. 30, 2023
Segment Reporting Information [Line Items]
Net sales	$ 951.6	$ 934.7
Operating profit:	133.3	132.9
Operating Segments | Acuity Brands Lighting
Segment Reporting Information [Line Items]
Net sales	886.0	876.4
Operating profit:	143.3	143.8
Operating Segments | Acuity Intelligent Spaces
Segment Reporting Information [Line Items]
Net sales	73.5	64.2
Operating profit:	10.8	5.3
Eliminations
Segment Reporting Information [Line Items]
Net sales	(7.9)	(5.9)
Unallocated corporate amounts
Segment Reporting Information [Line Items]
Operating profit:	$ (20.8)	$ (16.2)

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