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Significant Accounting Policies - Assets Held For Sale (Details) - Held-for-sale
$ in Millions
12 Months Ended
Aug. 31, 2022
USD ($)
building
Aug. 31, 2023
USD ($)
Aug. 31, 2021
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Assets held for sale, total $ 0.0 $ 0.0  
Building      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Assets held for sale, total     $ 6.6
Number of buildings classified as held for sale | building 1    
Gain on sale of building $ 2.3