Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Oct. 31, 2015	Jan. 31, 2015
Stockholders' equity
Treasury Stock, at Average Cost (in shares)	36,147,000	33,948,000
Class A Common Stock
Stockholders' equity
Class A Common Stock, par value	$ 0.01	$ 0.01
Class A Common Stock, shares authorized	150,000,000	150,000,000
Class A Common Stock, shares issued	103,300,000	103,300,000