Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jul. 31, 2012	Jan. 31, 2012
Statement of Financial Position [Abstract]
Preferred Stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred Stock, authorized shares	2,500,000	2,500,000
Series A convertible preferred stock, shares issued	293,000	293,000
Series A convertible preferred stock, shares outstanding	293,000	293,000
Series A convertible preferred stock, aggregate liquidation preference value (in dollars)	$ 358,869
Series A convertible preferred stock, redemption value (in dollars)	$ 358,869
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized shares	120,000,000	120,000,000
Common stock, issued shares	40,074,000	39,265,000
Common stock, outstanding shares	39,772,000	38,982,000
Treasury stock, shares	302,000	283,000