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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Aug. 31, 2021
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefit – Opening Balance $ 0.4 $ 1.6 $ 5.5
Gross increases – tax positions in prior period 1.3    
Gross decreases – tax positions in prior period   (0.9) (3.6)
Lapse of statute of limitations   (0.3) (0.3)
Unrecognized Tax Benefit – Ending Balance $ 1.7 $ 0.4 $ 1.6