Investment in Derivative Instruments (Tables)

6 Months Ended

Mar. 31, 2023

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 and commodity derivative contracts for the three and six months ended March 31, 2023 and 2022 and the fair value of these derivatives as of March 31, 2023 and September 30, 2022 (in thousands):

	For the Three Months Ended March 31,
			2023						2022
	(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	$	456	$	(1,279)	$	(823)	$	364	$	1,055	$	1,419
Interest expense, net	2,007		—		2,007		(431)		939		508
Total	$	2,463	$	(1,279)	$	1,184	$	(67)	$	1,994	$	1,927

	For the Six Months Ended March 31,
			2023						2022
	(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	$	1,057	$	(2,286)	$	(1,229)	$	857	$	778	$	1,635
Interest expense, net	3,342		—		3,342		(909)		1,352		443
Total	$	4,399	$	(2,286)	$	2,113	$	(52)	$	2,130	$	2,078

	March 31, 2023		September 30, 2022
Balance Sheet Classification	(unaudited)
Prepaid expenses and other current assets - commodity swaps	$	—	$	1,032
Other assets - commodity swaps	—		155
Other assets - interest rate swaps (1)	18,882		24,719
Accrued expense and other current liabilities - commodity swaps	(1,760)		(601)
Other long-term liabilities - commodity swaps	—		(60)
Net unrealized gain position	$	17,122	$	25,245

(1) Includes designated cash flow hedge of $18,882 and $24,719 as of March 31, 2023 and September 30, 2022, respectively.