Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Apr. 30, 2013	Jan. 31, 2013	Apr. 30, 2012
Preferred Stock, par value	$ 0.01	$ 0.01	$ 0.01
Preferred Stock, shares authorized	5,000,000	5,000,000	5,000,000
Preferred Stock, shares issued
Treasury Stock, shares	7,686,581	7,634,649	7,676,407
Common Stock
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01
Common Stock, shares authorized	100,000,000	100,000,000	100,000,000
Common Stock, shares issued	26,600,097	26,440,975	26,184,074
Class A Common Stock
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01
Common Stock, shares authorized	30,000,000	30,000,000	30,000,000
Common Stock, shares issued	6,632,967	6,632,967	6,632,967
Common Stock, shares outstanding	6,632,967	6,632,967	6,632,967