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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Aug. 31, 2021
Aug. 31, 2020
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, Shares, Issued (in shares) 54,018,978 53,885,165
Treasury stock, shares (in shares) 18,826,611 15,012,449
Accounts Receivable, Allowance for Credit Loss, Current $ 1.2 $ 2.6