Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Oct. 31, 2015	Jan. 31, 2015
Stockholders' equity
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	74,000,000	74,000,000
Common stock, shares issued	47,019,000	46,720,000
Common stock, shares outstanding	37,228,000	36,929,000
Common stock held in treasury, shares	9,791,000	9,791,000