Consolidated Balance Sheets Parenthetical (USD $) In Thousands, except Per Share data, unless otherwise specified	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2011
Consolidated Balance Sheets [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)	65,196	65,132	65,078
Treasury stock, at cost (in shares)	28,897	28,897	28,897