Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jan. 31, 2014	Jan. 31, 2013
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 327	$ 946
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	33,037,671	32,510,326
Common stock, shares outstanding	32,997,887	32,470,542
Treasury stock, shares	39,784	39,784