Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jul. 31, 2012	Jan. 31, 2012	Jul. 31, 2011
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
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	26,196,176	26,124,281	25,990,969
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	6,633,747
Common Stock, shares outstanding	6,632,967	6,632,967	6,633,747
Treasury Stock, shares	7,676,407	7,776,407	7,757,064