Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Apr. 30, 2018 |
Jan. 31, 2018 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Allowance for Doubtful Accounts | $ 2,234 | $ 2,217 |
| Preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Preferred stock, authorized (in shares) | 2,207,000 | 2,207,000 |
| Preferred stock, issued (in shares) | 0 | 0 |
| Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001 |
| Common stock, authorized (in shares) | 120,000,000 | 120,000,000 |
| Common stock, issued (in shares) | 65,677,000 | 65,497,000 |
| Common stock, outstanding (in shares) | 64,012,000 | 63,836,000 |
| Treasury stock, (in shares) | 1,665,000 | 1,661,000 |