Fair Value Measurements (Tables)

12 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The following table sets forth, by level within the fair value hierarchy, the Company’s financial assets and liabilities (as applicable) that were accounted for at fair value on a recurring basis as of September 30, 2021 and 2020. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The fair value presentation for over-the-counter swaps combines gas

and oil swaps because a significant number of the counterparties enter into both gas and oil swap agreements with the Company. 

	At Fair Value as of September 30, 2021
Recurring Fair Value Measures	Level 1		Level 2		Level 3		Netting Adjustments(1)		Total(1)
	(Dollars in thousands)
Assets:
Cash Equivalents — Money Market Mutual Funds	$	22,269	$	—	$	—	$	—	$	22,269
Hedging Collateral Deposits	88,610		—		—		—		88,610
Derivative Financial Instruments:
Over the Counter Swaps — Gas and Oil	—		1,802		—		(1,802)		—
Foreign Currency Contracts	—		938		—		(938)		—
Other Investments:
Balanced Equity Mutual Fund	34,433		—		—		—		34,433
Fixed Income Mutual Fund	70,639		—		—		—		70,639
Total	$	215,951	$	2,740	$	—	$	(2,740)	$	215,951
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps — Gas and Oil	$	—	$	601,551	$	—	$	(1,802)	$	599,749
Over the Counter No Cost Collars — Gas	—		17,385		—		—		17,385
Foreign Currency Contracts	—		214		—		(938)		(724)
Total	$	—	$	619,150	$	—	$	(2,740)	$	616,410
Total Net Assets/(Liabilities)	$	215,951	$	(616,410)	$	—	$	—	$	(400,459)

	At Fair Value as of September 30, 2020
Recurring Fair Value Measures	Level 1		Level 2		Level 3		Netting Adjustments(1)		Total(1)
	(Dollars in thousands)
Assets:
Cash Equivalents — Money Market Mutual Funds	$	12,285	$	—	$	—	$	—	$	12,285
Derivative Financial Instruments:
Over the Counter Swaps — Gas and Oil	—		36,418		—		(26,400)		10,018
Over the Counter No Cost Collars — Gas	—		—		—		(720)		(720)
Foreign Currency Contracts	—		259		—		(338)		(79)
Other Investments:
Balanced Equity Mutual Fund	39,618		—		—		—		39,618
Fixed Income Mutual Fund	72,253		—		—		—		72,253
Common Stock — Financial Services Industry	639		—		—		—		639
Total	$	124,795	$	36,677	$	—	$	(27,458)	$	134,014
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps — Gas and Oil	$	—	$	61,280	$	—	$	(26,400)	$	34,880
Over the Counter No Cost Collars — Gas	—		8,171		—		(720)		7,451
Foreign Currency Contracts	—		1,976		—		(338)		1,638
Total	$	—	$	71,427	$	—	$	(27,458)	$	43,969
Total Net Assets/(Liabilities)	$	124,795	$	(34,750)	$	—	$	—	$	90,045

(1)Netting Adjustments represent the impact of legally-enforceable master netting arrangements that allow the Company to net gain and loss positions held with the same counterparties. The net asset or net liability for each counterparty is recorded as an asset or liability on the Company’s balance sheet.