Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012	Jul. 31, 2011
Stock-Based Compensation (Textual) [Abstract]
Compensation expense recognized for stock-based awards granted	$ 870,000	$ 721,000,000	$ 1,064,000	$ 937,000
Accrued compensation expense	$ 211,000
Common stock shares granted	10,000
Options to purchase common stock granted to non-employee	60,000