Consolidated Balance Sheets (Unaudited) (Parenthetical) (Unaudited) - $ / shares	Apr. 30, 2020	Jan. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	67,500,000	67,436,000
Treasury Stock, Common, Shares	31,665,000	31,665,000