Segment Information - Schedule of Operating Segment (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
May 31, 2025	May 31, 2024	May 31, 2025	May 31, 2024
Segment Reporting Information [Line Items]
Net sales:	$ 1,178.6	$ 968.1	$ 3,136.5	$ 2,808.7
Operating profit:	139.8	145.3	383.3	396.3
Operating Segments \| Acuity Brands Lighting
Segment Reporting Information [Line Items]
Net sales:	923.2	898.5	2,649.8	2,618.4
Operating profit:	134.0	151.5	407.6	421.3
Operating Segments \| Acuity Intelligent Spaces
Segment Reporting Information [Line Items]
Net sales:	264.1	75.7	509.1	208.0
Operating profit:	27.4	12.5	48.1	26.9
Eliminations
Segment Reporting Information [Line Items]
Net sales:	(8.7)	(6.1)	(22.4)	(17.7)
Unallocated corporate amounts
Segment Reporting Information [Line Items]
Operating profit:	$ (21.6)	$ (18.7)	$ (72.4)	$ (51.9)

The net result for the period of deducting operating expenses from operating revenues.

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details