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Investment in Derivative Instruments (Tables) | 6 Months Ended
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Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivatives Instruments, Income Statement and Balance Sheet Classification | The following table represents the approximate amount of realized and unrealized gains (losses) and changes in fair value recognized in earnings on commodity derivative contracts for the three and six months ended March 31, 2020 and the fair value of these derivatives as of March 31, 2020 and September 30, 2019 (in thousands):
|  | For the Three Months Ended March 31, 2020 (unaudited) |  |  |  |  |  | For the Six Months Ended March 31, 2020 (unaudited) |  |  |  |  |
|  | Change in |  |  |  |  |  | Change in |  |  |  |  |
Income Statement Classification |  | Realized Gain (Loss) |  | Unrealized Gain (Loss) |  | Total Gain (Loss) |  | Realized Gain (Loss) |  | Unrealized Gain (Loss) |  | Total Gain (Loss) |
Cost of revenues |  | $ | (21) |  |  |  | $ | — |  |  |  | $ | (21) |  |  |  | $ | (21) |  |  |  | $ | — |  |  |  | $ | (21) |  |
Other income (expense) |  | — |  |  |  | (797) |  |  |  | (797) |  |  |  | — |  |  |  | (797) |  |  |  | (797) |  |
Interest expense, net |  | (24) |  |  |  | (1,532) |  |  |  | (1,556) |  |  |  | (49) |  |  |  | (1,466) |  |  |  | (1,515) |  |
Total |  | $ | (45) |  |  |  | $ | (2,329) |  |  |  | $ | (2,374) |  |  |  | $ | (70) |  |  |  | $ | (2,263) |  |  |  | $ | (2,333) |  |
|  | For the Three Months Ended March 31, 2019 (unaudited) |  |  |  |  |  | For the Six Months Ended March 31, 2019 (unaudited) |  |  |  |
|  | Change in |  |  |  |  |  | Change in |  |  |  |
Income Statement Classification |  | Realized Gain (Loss) |  | Unrealized Gain (Loss) |  | Total Gain (Loss) |  | Realized Gain (Loss) |  | Unrealized Gain (Loss) |  | Total Gain (Loss)
Cost of revenues |  | $ | — |  |  |  | $ | — |  |  |  | $ | — |  |  | $ | — |  |  |  | $ | — |  |  |  | $ | — |
Other income (expense) |  | — |  |  |  | — |  |  |  | — |  |  | — |  |  |  | — |  |  |  | — |
Interest expense, net |  |  | 9 |  |  |  | (106) |  |  |  | (97) |  |  |  | 5 |  |  |  | (331) |  |  |  | (326) |
Total |  |  | $ | 9 |  |  |  | $ | (106) |  |  |  | $ | (97) |  |  | $ | 5 |  |  |  | $ | (331) |  |  |  | $ | (326) |
|  | March 31, 2020 |  | September 30, 2019 |
Balance Sheet Classification |  | (unaudited) |  |  |
Accrued expense and other current liabilities - commodity swaps |  | $ | (588) |  |  | $ | — |  |
Other long-term liabilities - commodity swaps |  | $ | (209) |  |  | $ | — |  |
Other long-term liabilities - interest rate swaps |  |  | $ | (1,777) |  |  |  | $ | (311) |  |
Net gain (loss) position |  | $ | (2,574) |  |  |  | $ | (311) |  |  |

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- Definition Tabular disclosure of derivative instruments (including nonderivative instruments that are designated and qualify as hedging instruments) of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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