Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Aug. 31, 2017	Aug. 31, 2016
Accounts receivable, reserves	$ 2,738	$ 1,521
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	51,845,132	51,150,978
Common stock, shares outstanding (in shares)	39,023,032	40,038,225
Treasury stock, shares (in shares)	12,822,100	11,112,753