Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Stock Option Activity (Detail)

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Stockholders' Equity - Stock Option Activity (Detail) (USD $)
 1 Months Ended 12 Months Ended
May 31, 2012
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Equity [Abstract]        
Shares, Outstanding at beginning of period   1,917,448 2,125,371 2,382,174
Shares, Granted 875,000 12,500 892,500 250,000
Shares, Exercised   (118,528) (304,550) (253,668)
Shares, Forfeited/expired/cancelled   (309,244) (795,873) (253,135)
Shares, Outstanding at end of period   1,502,176 1,917,448 2,125,371
Shares, Options exercisable at end of period   1,440,521 937,444 1,878,707
Weighted average exercise price, Outstanding at beginning of period   $ 10.35 $ 11.83 $ 12.31
Weighted average exercise price, Granted   $ 10.10 $ 8.21 $ 6.74
Weighted average exercise price, Exercised   $ 9.10 $ 7.19 $ 7.04
Weighted average exercise price, Forfeited/expired/cancelled   $ 13.78 $ 13.11 $ 16.11
Weighted average exercise price, Outstanding at end of period   $ 9.77 $ 10.35 $ 11.83
Weighted average exercise price, Options exercisable at end of period   $ 9.90 $ 12.78 $ 12.51
Weighted average exercise price, Weighted average remaining contractual term (in years)   3 years 11 months 5 days 1 year 10 months 10 days 2 years 1 month 6 days