| Long-term Debt, Unclassified [Abstract] | Period [Axis] |
|---|
2016-02-01 - 2017-01-31 |
|---|
Long-term Debt, Unclassified [Abstract] | |
Summary of long-term debt | The following table summarizes our long-term debt at January 31, 2017 and 2016: | | | | | | | | | | | | January 31, | (in thousands) | | 2017 | | 2016 |
| | | | | 1.50% Convertible Senior Notes | | $ | 400,000 |
| | $ | 400,000 |
| February 2014 Term Loans | | 130,060 |
| | 130,729 |
| March 2014 Term Loans | | 278,978 |
| | 280,413 |
| Other debt | | 404 |
| | — |
| Less: Unamortized debt discounts and issuance costs | | (60,571 | ) | | (73,055 | ) | Total debt | | 748,871 |
| | 738,087 |
| Less: current maturities | | 4,611 |
| | 2,104 |
| Long-term debt | | $ | 744,260 |
| | $ | 735,983 |
|
|
Summary of future scheduled principal payments on term loans |
As of January 31, 2017, future scheduled principal payments on the February 2014 Term Loans and March 2014 Term Loans are presented in the following table: | | | | | | | | | | (in thousands) | | February 2014 | | March 2014 | Years Ending January 31, | | Term Loans | | Term Loans | 2018 | | $ | 1,337 |
| | $ | 2,869 |
| 2019 | | 1,337 |
| | 2,869 |
| 2020 | | 127,386 |
| | 273,240 |
| Total | | $ | 130,060 |
| | $ | 278,978 |
|
|
Schedule of components of interest expense | The following table presents the components of interest expense incurred on the Notes and on borrowings under our Credit Agreement for the years ended January 31, 2017, 2016, and 2015: | | | | | | | | | | | | | | | | Year Ended January 31, | (in thousands) | | 2017 | | 2016 | | 2015 | 1.50% Convertible Senior Notes: | | | | | | | Interest expense at 1.50% coupon rate | | $ | 6,000 |
| | $ | 6,000 |
| | $ | 3,717 |
| Amortization of debt discount | | 10,669 |
| | 10,123 |
| | 6,014 |
| Amortization of deferred debt issuance costs | | 1,007 |
| | 955 |
| | 566 |
| Total - 1.50% Convertible Senior Notes | | $ | 17,676 |
| | $ | 17,078 |
| | $ | 10,297 |
| | | | | | | | Borrowings under Credit Agreement: | | | | | | | Interest expense at contractual rates | | $ | 14,682 |
| | $ | 14,590 |
| | $ | 23,236 |
| Impact of interest rate swap agreement | | 259 |
| | — |
| | — |
| Amortization of debt discounts | | 58 |
| | 56 |
| | 116 |
| Amortization of deferred debt issuance costs | | 2,211 |
| | 2,166 |
| | 2,435 |
| Total - Borrowings under Credit Agreement | | $ | 17,210 |
| | $ | 16,812 |
| | $ | 25,787 |
|
|