Investment in Derivative Instruments (Tables)

12 Months Ended

Sep. 30, 2020

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location

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 fiscal years ended September 30, 2020 and 2019 and the fair value of these derivatives as of September 30, 2020 and 2019 (in thousands):

	For the Fiscal Year Ended September 30,
			2020						2019
	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	$	(432)	$	(503)	$	(935)	$	—	$	—	$	—
Interest expense, net	(388)		(1,397)		(1,785)		5		(565)		(560)
Total	$	(820)	$	(1,900)	$	(2,720)	$	5	$	(565)	$	(560)

	September 30,
Balance Sheet Classification	2020		2019
Accrued expense and other current liabilities - commodity swaps	$	(183)	$	—
Other long-term liabilities - commodity swaps	(320)		—
Other long-term liabilities - interest rate swaps	(1,708)		(311)
Net unrealized (loss) position	$	(2,211)	$	(311)