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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	May 31, 2019	Aug. 31, 2018
Current assets:
Allowance for doubtful accounts	$ 1.3	$ 1.3
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)	53,754,706	53,667,327
Treasury stock, shares (shares)	14,075,197	13,676,689

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A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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