Summary Of Significant Accounting Policies (Tables)

9 Months Ended

Jun. 30, 2022

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

The components, as reported on the Company’s Consolidated Balance Sheets, of the total cash, cash equivalents, and restricted cash presented on the Statement of Cash Flows are as follows (in thousands):

	Nine Months Ended  June 30, 2022				Nine Months Ended  June 30, 2021
	Balance at June 30, 2022		Balance at October 1, 2021		Balance at June 30, 2021		Balance at October 1, 2020
Cash and Temporary Cash Investments	$	432,576	$	31,528	$	118,012	$	20,541
Hedging Collateral Deposits	154,470		88,610		1,710		—
Cash, Cash Equivalents, and Restricted Cash	$	587,046	$	120,138	$	119,722	$	20,541

Schedule of Allowance for Uncollectible Accounts

Activity in the allowance for uncollectible accounts for the nine months ended June 30, 2022 and 2021 are as follows (in thousands):

	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Discounts on Purchased Receivables		Net Accounts Receivable Written-Off		Balance at End of Period
Nine Months Ended June 30, 2022
Allowance for Uncollectible Accounts	$	31,639	$	12,024	$	1,211	$	(2,891)	$	41,983
Nine Months Ended June 30, 2021
Allowance for Uncollectible Accounts	$	22,810	$	13,375	$	1,097	$	(4,960)	$	32,322

Schedule of Materials, Supplies and Emission Allowances

The components of the Company's materials, supplies and emission allowances are as follows (in thousands):

	At June 30, 2022		At September 30, 2021
Materials and Supplies - at average cost	$	39,634	$	34,880
Emission Allowances	—		18,680
	$	39,634	$	53,560

Components of Accumulated Other Comprehensive Loss

The components of Accumulated Other Comprehensive Loss and changes for the nine months ended June 30, 2022 and 2021, net of related tax effect, are as follows (amounts in parentheses indicate debits) (in thousands): 

	Gains and Losses on Derivative Financial Instruments		Funded Status of the Pension and Other Post-Retirement Benefit Plans		Total
Three Months Ended June 30, 2022
Balance at April 1, 2022	$	(584,812)	$	(69,442)	$	(654,254)
Other Comprehensive Gains and Losses Before Reclassifications	(145,322)		—		(145,322)
Amounts Reclassified From Other Comprehensive Income	216,708		—		216,708
Balance at June 30, 2022	$	(513,426)	$	(69,442)	$	(582,868)
Nine Months Ended June 30, 2022
Balance at October 1, 2021	$	(449,962)	$	(63,635)	$	(513,597)
Other Comprehensive Gains and Losses Before Reclassifications	(492,841)		—		(492,841)
Amounts Reclassified From Other Comprehensive Loss	429,377		—		429,377
Other Post-Retirement Adjustment for Regulatory Proceeding	—		(5,807)		(5,807)
Balance at June 30, 2022	$	(513,426)	$	(69,442)	$	(582,868)
Three Months Ended June 30, 2021
Balance at April 1, 2021	$	(12,096)	$	(89,892)	$	(101,988)
Other Comprehensive Gains and Losses Before Reclassifications	(145,986)		—		(145,986)
Amounts Reclassified From Other Comprehensive Loss	9,512		—		9,512
Balance at June 30, 2021	$	(148,570)	$	(89,892)	$	(238,462)
Nine Months Ended June 30, 2021
Balance at October 1, 2020	$	(24,865)	$	(89,892)	$	(114,757)
Other Comprehensive Gains and Losses Before Reclassifications	(136,098)		—		(136,098)
Amounts Reclassified From Other Comprehensive Loss	12,393		—		12,393
Balance at June 30, 2021	$	(148,570)	$	(89,892)	$	(238,462)

Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss

The details about the reclassification adjustments out of accumulated other comprehensive loss for the nine months ended June 30, 2022 and 2021 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):

Details About Accumulated Other Comprehensive Loss Components	Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Loss				Affected Line Item in the Statement Where Net Income is Presented
	Three Months Ended June 30,		Nine Months Ended June 30,
	2022	2021	2022	2021
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts	($298,372)	($13,281)	($591,271)	($17,351)	Operating Revenues
Foreign Currency Contracts	1	152	91	245	Operating Revenues
	(298,371)	(13,129)	(591,180)	(17,106)	Total Before Income Tax
	81,663	3,617	161,803	4,713	Income Tax Expense
	($216,708)	($9,512)	($429,377)	($12,393)	Net of Tax

Schedule of Other Current Assets

The components of the Company’s Other Current Assets are as follows (in thousands):

	At June 30, 2022		At September 30, 2021
Prepayments	$	16,419	$	14,164
Prepaid Property and Other Taxes	11,730		14,788
State Income Taxes Receivable	3,032		1,502
Regulatory Assets	30,178		29,206
	$	61,359	$	59,660

Schedule of Other Accruals and Current Liabilities

The components of the Company’s Other Accruals and Current Liabilities are as follows (in thousands):

	At June 30, 2022		At September 30, 2021
Accrued Capital Expenditures	$	59,849	$	42,541
Regulatory Liabilities	31,959		60,860
Reserve for Gas Replacement	21,775		—
Liability for Royalty and Working Interests	63,755		31,483
Federal Income Taxes Payable	154		154
Non-Qualified Benefit Plan Liability	15,408		15,408
Other	61,483		43,723
	$	254,383	$	194,169