LONG-TERM DEBT - INTEREST EXPENSE (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Apr. 30, 2018 |
Apr. 30, 2017 |
|
| 1.50% Convertible Senior Notes | ||
| Debt Instrument | ||
| Interest Expense at Coupon or Contractual Rate | $ 1,500 | $ 1,500 |
| Amortization of Debt Discount | 2,904 | 2,756 |
| Amortization of Deferred Debt Issuance Costs | 274 | 260 |
| Total Interest Expense | 4,678 | 4,516 |
| Credit Agreements | ||
| Debt Instrument | ||
| Interest Expense at Coupon or Contractual Rate | 3,866 | 3,719 |
| Amortization of Debt Discount | 16 | 15 |
| Amortization of Deferred Debt Issuance Costs | 378 | 541 |
| Total Interest Expense | 4,260 | 4,453 |
| Interest rate swap | Credit Agreements | ||
| Debt Instrument | ||
| Impact of Interest Rate Swap | $ 0 | $ 178 |