Consolidated Balance Sheets (Parenthetical) (USD $)	Aug. 31, 2012	Aug. 31, 2011
Preferred stock, without par value	$ 0	$ 0
Preferred stock, shares authorized	25,000,000	25,000,000
Preferred stock, outstanding	0	0
Common stock, without par value	$ 0	$ 0
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares outstanding	27,143,000	25,186,000