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Debt (Tables) | 12 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Long-term Debt Instruments | The following tables present our debt instruments outstanding, contractual maturities and interest expense:
| September 30, 2021 |  | September 30, 2020
(in thousands) | Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Discount and Issuance Costs |  | Carrying Amount
2024 Convertible Notes | $ | 143,750 |  |  | $ | (20,207) |  |  | $ | 123,543 |  |  | $ | 143,750 |  |  | $ | (26,557) |  |  | $ | 117,193 |
2025 Convertible Notes | 172,500 |  |  | (31,857) |  |  | 140,643 |  |  | 172,500 |  |  | (39,336) |  |  | 133,164 |
8.5% unsecured debt due 2024* | — |  |  | — |  |  | — |  |  | 872 |  |  | — |  |  | 872 |
Total | $ | 316,250 |  |  | $ | (52,064) |  |  | $ | 264,186 |  |  | $ | 317,122 |  |  | $ | (65,893) |  |  | $ | 251,229 |
Less current portion | — |  |  | — |  |  | — |  |  | 213 |  |  | — |  |  | 213 |
Total long-term debt | $ | 316,250 |  |  | $ | (52,064) |  |  | $ | 264,186 |  |  | $ | 316,909 |  |  | $ | (65,893) |  |  | $ | 251,016 |
* Amounts translated from Guatemalan quetzales as of the applicable period end.
Schedule of Maturities of Debt |
| Schedule of Contractual Maturities
(in thousands) | Total |  | Less Than 1 Year |  | 1 - 3 Years |  | 3 - 5 Years
2024 Convertible Notes* | $ | 143,750 |  |  | $ | — |  |  | $ | 143,750 |  |  | $ | — |
2025 Convertible Notes* | 172,500 |  |  | — |  |  | — |  |  | 172,500 |
Total | $ | 316,250 |  |  | $ | — |  |  | $ | 143,750 |  |  | $ | 172,500 |
* Excludes the potential impact of embedded derivatives.
Schedule of Interest Expense |
| Fiscal Year Ended September 30,
(in thousands) | 2021 |  | 2020 |  | 2019
2019 Convertible Notes: |  |  |  |  |
Contractual interest expense | $ | — |  |  | $ | — |  |  | $ | 3,074 |
Amortization of debt discount and deferred financing costs | — |  |  | — |  |  | 7,556 |
Total interest expense | $ | — |  |  | $ | — |  |  | $ | 10,630 |
2024 Convertible Notes: |  |  |  |  |
Contractual interest expense | $ | 4,133 |  |  | $ | 4,133 |  |  | $ | 4,133 |
Amortization of debt discount and deferred financing costs | 6,349 |  |  | 5,883 |  |  | 5,452 |
Total interest expense | $ | 10,482 |  |  | $ | 10,016 |  |  | $ | 9,585 |
2025 Convertible Notes: |  |  |  |  |
Contractual interest expense | $ | 4,097 |  |  | $ | 4,097 |  |  | $ | 4,097 |
Amortization of debt discount and deferred financing costs | 7,479 |  |  | 6,954 |  |  | 6,468 |
Total interest expense | $ | 11,576 |  |  | $ | 11,051 |  |  | $ | 10,565 |

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