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Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Financial assets (liabilities) that are measured at fair value on a recurring basis | The tables below present our financial assets (liabilities) that were carried and measured at fair value on a recurring basis:
Financial Assets (Liabilities) |  | Balance Sheet Location |  | June 30, 2018 |  | June 30, 2017 |  | September 30, 2017
|  |  |  | (in thousands)
2019 Convertible Notes Hedges — Level 2 |  | Prepaid expenses and other current assets |  | $ | 7,491 |  |  | $ | — |  |  | $ | — |
2019 Convertible Notes Hedges — Level 2 |  | Other assets, net |  | — |  |  | 5,900 |  |  | 6,591 |
2019 Convertible Notes Embedded Derivative — Level 2 |  | Current maturities of long-term debt, net |  | (7,491 | ) |  | — |  |  | — |
2019 Convertible Notes Embedded Derivative — Level 2 |  | Long-term debt, net |  | — |  |  | (5,900 | ) |  | (6,591 | )
Financial assets, temporary equity, and liabilities not measured at fair value in the consolidated balance sheet | The tables below present our financial assets and liabilities that were not measured at fair value on a recurring basis:
|  | Carrying Value |  | Estimated Fair Value
|  | June 30, 2018 |  | June 30, 2018 |  | Fair Value Measurement Using
|  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Financial assets: |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  | $ | 51,338 |  |  | $ | 57,116 |  |  | $ | — |  |  | $ | — |  |  | $ | 57,116 |
Investment in unconsolidated affiliate |  | 61,056 |  |  | 49,205 |  |  | 49,205 |  |  | — |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2019 Convertible Notes |  | $ | 184,823 |  |  | $ | 197,925 |  |  | $ | — |  |  | $ | 197,925 |  |  | $ | — |
2024 Convertible Notes |  | 104,562 |  |  | 195,974 |  |  | — |  |  | 195,974 |  |  | — |
2025 Convertible Notes |  | 118,335 |  |  | 168,464 |  |  | — |  |  | 168,464 |  |  | — |
|  | Carrying Value |  | Estimated Fair Value
|  | June 30, 2017 |  | June 30, 2017 |  | Fair Value Measurement Using
|  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Financial assets: |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  | $ | 63,277 |  |  | $ | 65,570 |  |  | $ | — |  |  | $ | — |  |  | $ | 65,570 |
Investment in unconsolidated affiliate |  | 41,725 |  |  | 37,306 |  |  | 37,306 |  |  | — |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2019 Convertible Notes |  | $ | 206,279 |  |  | $ | 218,500 |  |  | $ | — |  |  | $ | 218,500 |  |  | $ | — |
Term loan facility |  | 48,235 |  |  | 48,159 |  |  | — |  |  | — |  |  | 48,159 |
|  | Carrying Value |  | Estimated Fair Value
|  | September 30, 2017 |  | September 30, 2017 |  | Fair Value Measurement Using
|  | Level 1 |  | Level 2 |  | Level 3
|  | (in thousands)
Financial assets: |  |  |  |  |  |  |  |  |  |
Notes receivable, net |  | $ | 60,975 |  |  | $ | 74,262 |  |  | $ | — |  |  | $ | — |  |  | $ | 74,262 |
Investment in unconsolidated affiliate |  | 43,319 |  |  | 49,057 |  |  | 49,057 |  |  | — |  |  | — |
Financial liabilities: |  |  |  |  |  |  |  |  |  |
2019 Convertible Notes |  | $ | 177,346 |  |  | $ | 193,811 |  |  | $ | — |  |  | $ | 193,811 |  |  | $ | — |
2024 Convertible Notes |  | 100,870 |  |  | 175,016 |  |  | — |  |  | 175,016 |  |  | — |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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