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Investment in Derivative Instruments (Tables)
 6 Months Ended
Mar. 31, 2022
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, 2022 and 2021 and the fair value of these derivatives as of March 31, 2022 and September 30, 2021 (in thousands):

For the Three Months Ended March 31,
20222021
Change inChange in
Income Statement ClassificationRealized Gain (Loss)Unrealized Gain (Loss)Total Gain (Loss)Realized Gain (Loss)Unrealized Gain (Loss)Total Gain (Loss)
Cost of revenues$364 $1,055 $1,419 $94 $813 $907 
Interest expense, net(431)939 508 (168)400 232 
Total$(67)$1,994 $1,927 $(74)$1,213 $1,139 
For the Six Months Ended March 31,
20222021
Change inChange in
Income Statement ClassificationRealized Gain (Loss)Unrealized Gain (Loss)Total Gain (Loss)Realized Gain (Loss)Unrealized Gain (Loss)Total Gain (Loss)
Cost of revenues$857 $778 $1,635 $(45)$1,758 $1,713 
Interest expense, net(909)1,352 443 (348)619 271 
Total$(52)$2,130 $2,078 $(393)$2,377 $1,984 


March 31, 2022September 30, 2021
Balance Sheet Classification(unaudited)
Prepaid expenses and other current assets - commodity swaps$2,616 $990 
Other assets - commodity swaps39 822 
Other assets - interest rate swaps (1)
9,991 — 
Accrued expense and other current liabilities - interest rate swaps(16)(97)
Other long-term liabilities - commodity swaps(65)— 
Other long-term liabilities - interest rate swaps (2)
— (748)
Net unrealized gain position$12,565 $967 
(1) Includes designated cash flow hedge of $9,437 and $0 as of March 31, 2022 and September 30, 2021, respectively.
(2) Includes designated cash flow hedge of $0 and $(31) as of March 31, 2022 and September 30, 2021, respectively.