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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Feb. 28, 2021	Aug. 31, 2020
Current assets:
Allowance for doubtful accounts	$ 2.6	$ 2.6
Stockholders’ equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	50,000,000	50,000,000
Preferred stock, shares issued (shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	500,000,000	500,000,000
Common stock, shares issued (shares)	53,985,970	53,885,165
Treasury stock, shares (shares)	18,244,813	15,012,449

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