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Investment in Derivative Instruments (Tables) | 9 Months Ended
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Jun. 30, 2025
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 interest rate swap and commodity derivative contracts for the three and nine months ended June 30, 2025 and 2024 and the fair value of these derivatives as of June 30, 2025 and September 30, 2024 (in thousands):
|  | For the Three Months Ended June 30,
|  |  |  | 2025 |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |
|  | (unaudited) |  | (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 - Commodity Swap Contracts |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 10 |  |  | $ | 10 |  |  |  |  |  |  |
Interest expense, net - Interest Rate Swap Contracts |  | 1,876 |  |  | — |  |  | 1,876 |  |  | 2,635 |  |  | — |  |  | 2,635 |  |  |  |  |  |  |
Total |  | $ | 1,876 |  |  | $ | — |  |  | $ | 1,876 |  |  | $ | 2,635 |  |  | $ | 10 |  |  | $ | 2,645 |  |  |  |  |  |  |
|  | For the Nine Months Ended June 30,
|  |  |  | 2025 |  |  |  |  |  | 2024 |  |  |  |  |  |  |  |
|  | (unaudited) |  | (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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (61) |  |  | $ | (184) |  |  | $ | (245) |  |  |  |  |  |  |
Interest expense, net |  | 5,922 |  |  | — |  |  | 5,922 |  |  | 7,919 |  |  | — |  |  | 7,919 |  |  |  |  |  |  |
Total |  | $ | 5,922 |  |  | $ | — |  |  | $ | 5,922 |  |  | $ | 7,858 |  |  | $ | (184) |  |  | $ | 7,674 |  |  |  |  |  |  |
|  | June 30, 2025 |  | September 30, 2024
Balance Sheet Classification |  | (unaudited) |  |
Other assets - interest rate swaps (1) |  | $ | 9,379 |  |  | $ | 11,646 |
Net unrealized gain position |  | $ | 9,379 |  |  | $ | 11,646 |
(1) Includes designated cash flow hedge of $9.4 million and $11.6 million as of June 30, 2025 and September 30, 2024, respectively.

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C + Details
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