Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 30, 2013	Jan. 31, 2013	Apr. 30, 2012
Statement of Financial Position [Abstract]
Common Stock, par value (in dollars per share)	$ 1	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000	100,000	100,000
Common stock, shares issued (in shares)	65,240	65,223	65,152
Treasury stock, at cost (in shares)	28,897	28,897	28,897