Summary Of Significant Accounting Policies (Tables)

6 Months Ended

Mar. 31, 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):

	Six Months Ended  March 31, 2022				Six Months Ended  March 31, 2021
	Balance at October 1, 2021		Balance at March 31, 2022		Balance at October 1, 2020		Balance at March 31, 2021
Cash and Temporary Cash Investments	$	31,528	$	52,569	$	20,541	$	80,467
Hedging Collateral Deposits	88,610		102,370		—		—
Cash, Cash Equivalents, and Restricted Cash	$	120,138	$	154,939	$	20,541	$	80,467

Schedule of Allowance for Uncollectible Accounts

Activity in the allowance for uncollectible accounts for the six months ended March 31, 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
Six Months Ended March 31, 2022
Allowance for Uncollectible Accounts	$	31,639	$	9,684	$	790	$	(630)	$	41,483
Six Months Ended March 31, 2021
Allowance for Uncollectible Accounts	$	22,810	$	11,074	$	737	$	(4,493)	$	30,128

Schedule of Materials, Supplies and Emission Allowances

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

	At March 31, 2022		At September 30, 2021
Materials and Supplies - at average cost	$	37,769	$	34,880
Emission Allowances	11,118		18,680
	$	48,887	$	53,560

Components of Accumulated Other Comprehensive Loss

The components of Accumulated Other Comprehensive Loss and changes for the six months ended March 31, 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 March 31, 2022
Balance at January 1, 2022	$	(213,391)	$	(63,635)	$	(277,026)
Other Comprehensive Gains and Losses Before Reclassifications	(466,001)		—		(466,001)
Amounts Reclassified From Other Comprehensive Loss	94,580		—		94,580
Other Post-Retirement Adjustment for Regulatory Proceeding	—		(5,807)		(5,807)
Balance at March 31, 2022	$	(584,812)	$	(69,442)	$	(654,254)
Six Months Ended March 31, 2022
Balance at October 1, 2021	$	(449,962)	$	(63,635)	$	(513,597)
Other Comprehensive Gains and Losses Before Reclassifications	(347,518)		—		(347,518)
Amounts Reclassified From Other Comprehensive Loss	212,668		—		212,668
Other Post-Retirement Adjustment for Regulatory Proceeding	—		(5,807)		(5,807)
Balance at March 31, 2022	$	(584,812)	$	(69,442)	$	(654,254)
Three Months Ended March 31, 2021
Balance at January 1, 2021	$	10,151	$	(89,892)	$	(79,741)
Other Comprehensive Gains and Losses Before Reclassifications	(24,903)		—		(24,903)
Amounts Reclassified From Other Comprehensive Loss	2,656		—		2,656
Balance at March 31, 2021	$	(12,096)	$	(89,892)	$	(101,988)
Six Months Ended March 31, 2021
Balance at October 1, 2020	$	(24,865)	$	(89,892)	$	(114,757)
Other Comprehensive Gains and Losses Before Reclassifications	9,888		—		9,888
Amounts Reclassified From Other Comprehensive Income	2,881		—		2,881
Balance at March 31, 2021	$	(12,096)	$	(89,892)	$	(101,988)

Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss

The details about the reclassification adjustments out of accumulated other comprehensive loss for the six months ended March 31, 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 March 31,		Six Months Ended March 31,
	2022	2021	2022	2021
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts	($130,271)	($3,761)	($292,899)	($4,071)	Operating Revenues
Foreign Currency Contracts	50	95	90	94	Operating Revenues
	(130,221)	(3,666)	(292,809)	(3,977)	Total Before Income Tax
	35,641	1,010	80,141	1,096	Income Tax Expense
	($94,580)	($2,656)	($212,668)	($2,881)	Net of Tax

Schedule of Other Current Assets

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

	At March 31, 2022		At September 30, 2021
Prepayments	$	10,242	$	14,164
Prepaid Property and Other Taxes	24,048		14,788
State Income Taxes Receivable	3,539		1,502
Regulatory Assets	30,436		29,206
	$	68,265	$	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 March 31, 2022		At September 30, 2021
Accrued Capital Expenditures	$	41,216	$	42,541
Regulatory Liabilities	29,118		60,860
Reserve for Gas Replacement	43,752		—
Liability for Royalty and Working Interests	41,143		31,483
Federal Income Taxes Payable	151		154
Non-Qualified Benefit Plan Liability	15,408		15,408
Other	47,351		43,723
	$	218,139	$	194,169