Stock-Based Compensation (Details Textual) (USD $)	3 Months Ended			6 Months Ended			6 Months Ended									12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Oct. 31, 2009	Jul. 31, 2013	Jul. 31, 2012	Jan. 31, 2013	Jul. 31, 2013 Maximum [Member]	Jul. 31, 2013 Minimum [Member]	Jul. 31, 2013 Restricted Stock Units (RSUs) [Member]	Jul. 31, 2013 Restricted Stock Units (RSUs) [Member] Minimum [Member]	Jul. 31, 2013 Performance Shares [Member]	Jul. 31, 2013 Performance Shares [Member] Maximum [Member]	Jul. 31, 2013 Performance Shares [Member] Minimum [Member]	Jul. 31, 2013 2006 Stock Incentive Plan [Member]	Jul. 31, 2013 Time Based Options [Member]	Jan. 31, 2013 Unvested performance based options [Member] Maximum [Member]	Jan. 31, 2013 Unvested performance based options [Member] Minimum [Member]
Stock Based Compensation (Textual) [Abstract]
Awards vesting period									3 years		3 years				3 years
Expiration of granted option														10 years
Restricted Stock Units Granted									4,728,100
Cancelled, Shares									(788,750)
Number of options outstanding	8,015,329			8,015,329		7,799,011
Weighted average exercise price of options vested and expected to vest	$ 2.73			$ 2.73
Common stock issued, Shares									100,000
Performance target for achievement																150.00%	50.00%
Compensation expense for awards recognized	$ 838,000	$ 525,000		$ 1,345,000	$ 1,009,000
Unrecognized compensation costs recognition period							3 years	2 years		3 years		3 years	2 years
Number of Options Outstanding, Granted				3,345,000
Number of Options Outstanding, Cancelled				2,992,626
Unrecognized compensation costs	2,500,000			2,500,000					9,700,000
Stock Based Compensation (Additional Textual) [Abstract]
Stock expense expected to be recognized over the remaining future vesting period	$ 100,000			$ 100,000
Offer for eligible employees and independent directors to exchange ratio under Stock Incentive Plan			one-for-one basis