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Debt (Tables) | 9 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Long term debt instruments | The following tables present our debt instruments outstanding, contractual maturities and interest expense:
| June 30, 2018 |  | June 30, 2017 |  | September 30, 2017
| 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 |  |  | $ | (10,177 | ) |  | $ | 184,823 |  |  | $ | 230,000 |  |  | $ | (23,721 | ) |  | $ | 206,279 |  |  | $ | 195,000 |  |  | $ | (17,654 | ) |  | $ | 177,346 |
2019 Convertible Notes Embedded Derivative | 7,491 |  |  | — |  |  | 7,491 |  |  | 5,900 |  |  | — |  |  | 5,900 |  |  | 6,591 |  |  | — |  |  | 6,591 |
2024 Convertible Notes | 143,750 |  |  | (39,188 | ) |  | 104,562 |  |  | — |  |  | — |  |  | — |  |  | 143,750 |  |  | (42,880 | ) |  | 100,870 |
2025 Convertible Notes | 172,500 |  |  | (54,165 | ) |  | 118,335 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Other debt* | 3,482 |  |  | — |  |  | 3,482 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Term loan facility | — |  |  | — |  |  | — |  |  | 50,000 |  |  | (1,765 | ) |  | 48,235 |  |  | — |  |  | — |  |  | — |
Total | $ | 522,223 |  |  | $ | (103,530 | ) |  | $ | 418,693 |  |  | $ | 285,900 |  |  | $ | (25,486 | ) |  | $ | 260,414 |  |  | $ | 345,341 |  |  | $ | (60,534 | ) |  | $ | 284,807 |
Less current portion | (205,973 | ) |  | 10,177 |  |  | (195,796 | ) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total long-term debt | $ | 316,250 |  |  | $ | (93,353 | ) |  | $ | 222,897 |  |  | $ | 285,900 |  |  | $ | (25,486 | ) |  | $ | 260,414 |  |  | $ | 345,341 |  |  | $ | (60,534 | ) |  | $ | 284,807 |
* | Purchase money financing; debt classified as current as collateral was destroyed. Insurance proceeds are expected to cover the entire loss.
Principal payment schedule |
| Schedule of Contractual Maturities
| 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 |
Other debt | 3,482 |  |  | 3,482 |  |  | — |  |  | — |  |  | — |
| $ | 514,732 |  |  | $ | 198,482 |  |  | $ | — |  |  | $ | — |  |  | $ | 316,250 |
* | Excludes the potential impact of embedded derivatives.
Schedule of Interest Expense |
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
| (in millions)
2019 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 1.1 |  |  | $ | 1.3 |  |  | $ | 3.2 |  |  | $ | 3.8 |
Amortization of debt discount and deferred financing costs | 2.5 |  |  | 2.8 |  |  | 7.5 |  |  | 8.3 |
Total interest expense | $ | 3.6 |  |  | $ | 4.1 |  |  | $ | 10.7 |  |  | $ | 12.1 |
2024 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 1.1 |  |  | $ | — |  |  | $ | 3.1 |  |  | $ | — |
Amortization of debt discount and deferred financing costs | 1.3 |  |  | — |  |  | 3.8 |  |  | — |
Total interest expense | $ | 2.4 |  |  | $ | — |  |  | $ | 6.9 |  |  | $ | — |
2025 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 0.5 |  |  | $ | — |  |  | $ | 0.5 |  |  | $ | — |
Amortization of debt discount and deferred financing costs | 0.8 |  |  | — |  |  | 0.8 |  |  | — |
Total interest expense | $ | 1.3 |  |  | $ | — |  |  | $ | 1.3 |  |  | $ | — |

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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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