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Revenue Recognition (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Disaggregation Of Revenue [Line Items]    
Unsatisfied performance obligation amount $ 4.5 $ 11.3
Revenue recognized 17.0  
Other Current Assets [Member]    
Disaggregation Of Revenue [Line Items]    
Contract assets 1.3 0.9
Other Current and Noncurrent Liabilities [Member]    
Disaggregation Of Revenue [Line Items]    
Contract liabilities $ 37.4 $ 19.6