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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Aug. 31, 2019
Aug. 31, 2018
Current assets:    
Allowance for doubtful accounts $ 1.0 $ 1.3
Stockholders’ equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, issued (in shares) 53,778,155 53,667,327
Treasury stock (in shares) 14,325,197 13,676,689