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Long-term Debt (Tables) | 3 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Long term debt instruments | The following tables present our long-term debt instruments outstanding as well as future principal payments due:
| December 31, 2018 |  | December 31, 2017 |  | September 30, 2018
| Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount
| (in thousands)
2019 Convertible Notes | $ | 195,000 |  |  | $ | (4,924 | ) |  | $ | 190,076 |  |  | $ | 195,000 |  |  | $ | (15,165 | ) |  | $ | 179,835 |  |  | $ | 195,000 |  |  | $ | (7,567 | ) |  | $ | 187,433 |
2019 Convertible Notes Embedded Derivative | 21 |  |  | — |  |  | 21 |  |  | 12,863 |  |  | — |  |  | 12,863 |  |  | 2,552 |  |  | — |  |  | 2,552 |
2024 Convertible Notes | 143,750 |  |  | (36,568 | ) |  | 107,182 |  |  | 143,750 |  |  | (41,687 | ) |  | 102,063 |  |  | 143,750 |  |  | (37,892 | ) |  | 105,858 |
2025 Convertible Notes | 172,500 |  |  | (51,184 | ) |  | 121,316 |  |  | — |  |  | — |  |  | — |  |  | 172,500 |  |  | (52,764 | ) |  | 119,736 |
8.5% unsecured notes due 2024* | 1,237 |  |  | — |  |  | 1,237 |  |  | — |  |  | — |  |  | — |  |  | 1,304 |  |  | — |  |  | 1,304 |
CASHMAX secured borrowing facility** | 1,160 |  |  | (826 | ) |  | 334 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 513,668 |  |  | $ | (93,502 | ) |  | $ | 420,166 |  |  | $ | 351,613 |  |  | $ | (56,852 | ) |  | $ | 294,761 |  |  | $ | 515,106 |  |  | $ | (98,223 | ) |  | $ | 416,883 |
Less current portion | 195,162 |  |  | (4,924 | ) |  | 190,238 |  |  | — |  |  | — |  |  | — |  |  | 197,748 |  |  | (7,567 | ) |  | 190,181 |
Total long-term debt | $ | 318,506 |  |  | $ | (88,578 | ) |  | $ | 229,928 |  |  | $ | 351,613 |  |  | $ | (56,852 | ) |  | $ | 294,761 |  |  | $ | 317,358 |  |  | $ | (90,656 | ) |  | $ | 226,702 |
* | Amount translated from Guatemalan quetzals as of December 31, 2018. Certain disclosures omitted due to materiality considerations.
** See description below.
Principal payment schedule |
| Principal Payment Schedule
| Total |  | Less Than 1 Year |  | 1 - 3 Years |  | 3 - 5 Years |  | More Than 5 Years
| (in thousands)
2019 Convertible Notes* | $ | 195,000 |  |  | $ | 195,000 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2024 Convertible Notes* | 143,750 |  |  | — |  |  | — |  |  | — |  |  | 143,750 |
2025 Convertible Notes* | 172,500 |  |  | — |  |  | — |  |  | — |  |  | 172,500 |
8.5% unsecured notes due 2024 | 1,237 |  |  | 141 |  |  | 424 |  |  | 424 |  |  | 248 |
CASHMAX secured borrowing facility | 1,160 |  |  | — |  |  | 1,160 |  |  | — |  |  | — |
| $ | 513,647 |  |  | $ | 195,141 |  |  | $ | 1,584 |  |  | $ | 424 |  |  | $ | 316,498 |
* Excludes the potential impact of embedded derivatives.
Schedule of interest expense |
| Three Months Ended December 31,
| 2018 |  | 2017
| (in millions)
2019 Convertible Notes: |  |  |
Contractual interest expense | $ | 1.1 |  |  | $ | 1.1 |
Amortization of debt discount and deferred financing costs | 2.6 |  |  | 2.5 |
Total interest expense | $ | 3.7 |  |  | $ | 3.6 |
2024 Convertible Notes: |  |  |
Contractual interest expense | $ | 1.0 |  |  | $ | 1.0 |
Amortization of debt discount and deferred financing costs | 1.4 |  |  | 1.3 |
Total interest expense | $ | 2.4 |  |  | $ | 2.3 |
2025 Convertible Notes: |  |  |
Contractual interest expense | $ | 1.0 |  |  | $ | — |
Amortization of debt discount and deferred financing costs | 1.6 |  |  | — |
Total interest expense | $ | 2.6 |  |  | $ | — |

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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