Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2023

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 March 31, 2023 and September 30, 2022.  Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement.  

Recurring Fair Value Measures	At fair value as of March 31, 2023
(Thousands of Dollars)	Level 1		Level 2		Level 3		Netting Adjustments(1)		Total(1)
Assets:
Cash Equivalents – Money Market Mutual Funds	$	53,519	$	—	$	—	$	—	$	53,519
Derivative Financial Instruments:
Over the Counter Swaps – Gas	—		59,179		—		(52,327)		6,852
Over the Counter No Cost Collars – Gas	—		56,879		—		(26,070)		30,809
Contingent Consideration for Asset Sale	—		5,903		—		—		5,903
Foreign Currency Contracts	—		213		—		(1,353)		(1,140)
Other Investments:
Balanced Equity Mutual Fund	15,924		—		—		—		15,924
Fixed Income Mutual Fund	15,949		—		—		—		15,949
Total	$	85,392	$	122,174	$	—	$	(79,750)	$	127,816
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps – Gas	$	—	$	91,509	$	—	$	(52,327)	$	39,182
Over the Counter No Cost Collars – Gas	—		21,616		—		(26,070)		(4,454)
Foreign Currency Contracts	—		1,388		—		(1,353)		35
Total	$	—	$	114,513	$	—	$	(79,750)	$	34,763
Total Net Assets/(Liabilities)	$	85,392	$	7,661	$	—	$	—	$	93,053

Recurring Fair Value Measures	At fair value as of September 30, 2022
(Thousands of Dollars)	Level 1		Level 2		Level 3		Netting Adjustments(1)		Total(1)
Assets:
Cash Equivalents – Money Market Mutual Funds	$	35,015	$	—	$	—	$	—	$	35,015
Hedging Collateral Deposits	91,670		—		—		—		91,670
Derivative Financial Instruments:
Over the Counter Swaps – Gas	—		5,177		—		(4,178)		999
Contingent Consideration for Asset Sale	—		8,176		—		—		8,176
Foreign Currency Contracts	—		128		—		(128)		—
Other Investments:
Balanced Equity Mutual Fund	19,506		—		—		—		19,506
Fixed Income Mutual Fund	33,348		—		—		—		33,348
Total	$	179,539	$	13,481	$	—	$	(4,306)	$	188,714
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps – Gas	$	—	$	517,464	$	—	$	(4,178)	$	513,286
Over the Counter No Cost Collars – Gas	—		270,453		—		—		270,453
Foreign Currency Contracts	—		2,048		—		(128)		1,920
Total	$	—	$	789,965	$	—	$	(4,306)	$	785,659
Total Net Assets/(Liabilities)	$	179,539	$	(776,484)	$	—	$	—	$	(596,945)

(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.