Fair Value Measurements (Tables)

3 Months Ended

Dec. 31, 2022

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 December 31, 2022 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 December 31, 2022
(Thousands of Dollars)	Level 1		Level 2		Level 3		Netting Adjustments(1)		Total(1)
Assets:
Cash Equivalents – Money Market Mutual Funds	$	228,919	$	—	$	—	$	—	$	228,919
Hedging Collateral Deposits	1,600		—		—		—		1,600
Derivative Financial Instruments:
Over the Counter Swaps – Gas	—		9,091		—		(6,881)		2,210
Over the Counter No Cost Collars – Gas	—		13,915		—		(12,274)		1,641
Contingent Consideration for Asset Sale	—		8,374		—		—		8,374
Foreign Currency Contracts	—		211		—		(266)		(55)
Other Investments:
Balanced Equity Mutual Fund	14,929		—		—		—		14,929
Fixed Income Mutual Fund	15,608		—		—		—		15,608
Total	$	261,056	$	31,591	$	—	$	(19,421)	$	273,226
Liabilities:
Derivative Financial Instruments:
Over the Counter Swaps – Gas	$	—	$	233,112	$	—	$	(6,881)	$	226,231
Over the Counter No Cost Collars – Gas	—		116,352		—		(12,274)		104,078
Foreign Currency Contracts	—		1,478		—		(266)		1,212
Total	$	—	$	350,942	$	—	$	(19,421)	$	331,521
Total Net Assets/(Liabilities)	$	261,056	$	(319,351)	$	—	$	—	$	(58,295)

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.