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Revenue - Schedule of Disaggregated Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended
Nov. 30, 2024
Nov. 30, 2023
Disaggregation of Revenue [Line Items]    
Total sales $ 951.6 $ 934.7
Operating Segments | Acuity Brands Lighting    
Disaggregation of Revenue [Line Items]    
Total sales 886.0 876.4
Operating Segments | Acuity Intelligent Spaces    
Disaggregation of Revenue [Line Items]    
Total sales 73.5 64.2
Operating Segments | Independent sales network | Acuity Brands Lighting    
Disaggregation of Revenue [Line Items]    
Total sales 643.9 625.2
Operating Segments | Direct sales network | Acuity Brands Lighting    
Disaggregation of Revenue [Line Items]    
Total sales 107.2 97.4
Operating Segments | Retail sales | Acuity Brands Lighting    
Disaggregation of Revenue [Line Items]    
Total sales 44.9 55.6
Operating Segments | Corporate accounts | Acuity Brands Lighting    
Disaggregation of Revenue [Line Items]    
Total sales 32.7 41.5
Operating Segments | OEM and other | Acuity Brands Lighting    
Disaggregation of Revenue [Line Items]    
Total sales 57.3 56.7
Eliminations    
Disaggregation of Revenue [Line Items]    
Total sales $ (7.9) $ (5.9)