v3.25.2
Goodwill and Intangible Assets - Schedule of Changes in Goodwill (Details) - USD ($)
$ in Millions
 9 Months Ended
May 31, 2025
May 31, 2024
Goodwill [Roll Forward]    
Goodwill, beginning balance $ 1,098.7 $ 1,097.9
Provisional amounts from acquired business 363.5  
Adjustments to provisional amounts from acquired businesses 31.5  
Foreign currency translation adjustments (1.1) (1.2)
Goodwill, ending balance 1,492.6 1,096.7
Acuity Brands Lighting    
Goodwill [Roll Forward]    
Goodwill, beginning balance 1,015.1 1,014.4
Provisional amounts from acquired business 0.0  
Adjustments to provisional amounts from acquired businesses 0.0  
Foreign currency translation adjustments (0.3) (0.7)
Goodwill, ending balance 1,014.8 1,013.7
Acuity Intelligent Spaces    
Goodwill [Roll Forward]    
Goodwill, beginning balance 83.6 83.5
Provisional amounts from acquired business 363.5  
Adjustments to provisional amounts from acquired businesses 31.5  
Foreign currency translation adjustments (0.8) (0.5)
Goodwill, ending balance $ 477.8 $ 83.0