CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Oct. 31, 2011	Jan. 31, 2011
Accounts receivable, allowance for doubtful accounts	$ 873	$ 995
Convertible preferred stock, par value	$ 0.01	$ 0.01
Convertible preferred stock, shares authorized	5,000,000	5,000,000
Convertible preferred stock, issued	0	0
Convertible preferred stock, outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	32,198,753	31,876,815
Common stock, shares outstanding	32,158,969	31,837,031
Treasury stock, common shares	39,784	39,784