Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Nov. 30, 2013	Aug. 31, 2013	Nov. 30, 2012
Condensed Consolidated Balance Sheets [Abstract]
Receivables, allowance	$ 3,349	$ 2,853	$ 1,645
Preferred stock, par value	$ 1	$ 1	$ 1
Preferred stock, authorized	2,000,000	2,000,000	2,000,000
Preferred stock, issued	0	0	0
Common stock, par value	$ 1	$ 1	$ 1
Common stock, authorized	25,000,000	25,000,000	25,000,000
Common stock, issued	18,620,000
Treasury stock, shares	5,698,000	5,698,000	5,698,000