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Special Charges - Schedule of Details of Special Charges Incurred (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Restructuring and Related Activities [Abstract]      
Trade name impairment charges $ 14.0   $ 0.0
Severance and employee-related costs 7.7   1.7
Operating lease asset group impairment charge 4.3   0.0
Other restructuring costs 0.9   1.6
Total special charges $ 26.9 $ 0.0 $ 3.3