CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands |
Apr. 30, 2016 |
Jan. 31, 2016 |
|---|---|---|
| Statement Of Financial Position [Abstract] | ||
| Customer receivables, allowance | $ 3,915 | $ 3,494 |
| Common stock, par value | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 60,000,000 | 60,000,000 |
| Common stock, shares issued | 19,803,000 | 19,789,000 |
| Common stock, shares outstanding | 19,803,000 | 19,789,000 |