Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Common stock, par value	$ 1	$ 1	$ 1
Common stock, shares authorized	100,000	100,000	100,000
Common stock, shares issued	32,566	32,511	32,478
Treasury stock, shares	14,449	14,449	14,449