Consolidated Balance Sheets (Parenthetical) (USD $)	Aug. 31, 2013	Aug. 31, 2012
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares issued	0	0
Class A Common Stock
Common stock, shares authorized	75,000,000	75,000,000
Common stock, par value	$ 1	$ 1
Common stock, shares issued	26,171,000	25,219,000
Common stock, shares outstanding	26,171,000	25,219,000
Class B Common Stock
Common stock, shares authorized	25,000,000	25,000,000
Common stock, par value	$ 1	$ 1
Common stock, shares issued	393,000	1,113,000
Common stock, shares outstanding	393,000	1,113,000