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Common Stock and Related Matters - Schedule of Changes in Common Stock (Details) - USD ($)
$ in Millions
 12 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2019
Common Stock [Roll Forward]      
Balance beginning of period (in shares) 53,885,165    
Balance, beginning of period $ 0.5    
Issuance of restricted stock grants, net of cancellations 28.8 $ 32.7 $ 23.1
Stock options exercised $ 2.2 $ 0.1  
Balance end of period (in shares) 54,018,978 53,885,165  
Balance end of period $ 0.5 $ 0.5  
Common Stock      
Common Stock [Roll Forward]      
Balance beginning of period (in shares) 53,900,000 53,800,000 53,700,000
Balance, beginning of period $ 0.5 $ 0.5 $ 0.5
Issuance of restricted stock grants, net of cancellations (in shares) 100,000 100,000 100,000
Issuance of restricted stock grants, net of cancellations $ 0.0 $ 0.0 $ 0.0
Stock options exercised (in shares) 0 0  
Stock options exercised $ 0.0 $ 0.0  
Balance end of period (in shares) 54,000,000.0 53,900,000 53,800,000
Balance end of period $ 0.5 $ 0.5 $ 0.5