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Segment Information - Schedule of Operating Segment (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]
Net sales	$ 1,006.3	$ 905.9	$ 1,957.9	$ 1,840.6
Operating profit:	110.2	118.1	243.5	251.0
Operating Segments | Acuity Brands Lighting
Segment Reporting Information [Line Items]
Net sales	840.6	843.5	1,726.6	1,719.9
Operating profit:	130.3	126.0	273.6	269.8
Operating Segments | Acuity Intelligent Spaces
Segment Reporting Information [Line Items]
Net sales	171.5	68.1	245.0	132.3
Operating profit:	9.9	9.1	20.7	14.4
Eliminations
Segment Reporting Information [Line Items]
Net sales	(5.8)	(5.7)	(13.7)	(11.6)
Unallocated corporate amounts
Segment Reporting Information [Line Items]
Operating profit:	$ (30.0)	$ (17.0)	$ (50.8)	$ (33.2)

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