Consolidated Balance Sheets (Parenthetical) (USD $)	Aug. 31, 2011	Aug. 31, 2010
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	0	0
Class A Common Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	24,241,000	22,700,000
Common stock, shares outstanding	24,241,000	22,700,000
Class B Common Stock [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	3,060,000	4,721,000
Common stock, shares outstanding	3,060,000	4,721,000