Summary Of Significant Accounting Policies (Tables)

3 Months Ended

Dec. 31, 2021

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):

	Three Months Ended  December 31, 2021				Three Months Ended  December 31, 2020
	Balance at October 1, 2021		Balance at December 31, 2021		Balance at October 1, 2020		Balance at December 31, 2020
Cash and Temporary Cash Investments	$	31,528	$	79,065	$	20,541	$	109,413
Hedging Collateral Deposits	88,610		—		—		—
Cash, Cash Equivalents, and Restricted Cash	$	120,138	$	79,065	$	20,541	$	109,413

Schedule of Allowance for Uncollectible Accounts

Activity in the allowance for uncollectible accounts for the three months ended December 31, 2021 and 2020 are as follows (in thousands):

	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Discounts on Purchased Receivables		Net Accounts Receivable Recovered (Written-Off)		Balance at End of Period
Three Months Ended December 31, 2021
Allowance for Uncollectible Accounts	$	31,639	$	3,742	$	161	$	57	$	35,599
Three Months Ended December 31, 2020
Allowance for Uncollectible Accounts	$	22,810	$	4,679	$	170	$	(1,438)	$	26,221

Schedule of Materials, Supplies and Emission Allowances

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

	At December 31, 2021		At September 30, 2021
Materials and Supplies - at average cost	$	36,233	$	34,880
Emission Allowances	11,118		18,680
	$	47,351	$	53,560

Components of Accumulated Other Comprehensive Loss

The components of Accumulated Other Comprehensive Loss and changes for the three months ended December 31, 2021 and 2020, 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 December 31, 2021
Balance at October 1, 2021	$	(449,962)	$	(63,635)	$	(513,597)
Other Comprehensive Gains and Losses Before Reclassifications	118,483		—		118,483
Amounts Reclassified From Other Comprehensive Income	118,088		—		118,088
Balance at December 31, 2021	$	(213,391)	$	(63,635)	$	(277,026)
Three Months Ended December 31, 2020
Balance at October 1, 2020	$	(24,865)	$	(89,892)	$	(114,757)
Other Comprehensive Gains and Losses Before Reclassifications	34,791		—		34,791
Amounts Reclassified From Other Comprehensive Income	225		—		225
Balance at December 31, 2020	$	10,151	$	(89,892)	$	(79,741)

Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss

The details about the reclassification adjustments out of accumulated other comprehensive loss for the three months ended December 31, 2021 and 2020 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 December 31,
	2021	2020
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts	($162,629)	($310)	Operating Revenues
Foreign Currency Contracts	41	(1)	Operating Revenues
	(162,588)	(311)	Total Before Income Tax
	44,500	86	Income Tax Expense
	($118,088)	($225)	Net of Tax

Schedule of Other Current Assets

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

	At December 31, 2021		At September 30, 2021
Prepayments	$	12,997	$	14,164
Prepaid Property and Other Taxes	15,366		14,788
State Income Taxes Receivable	3,516		1,502
Regulatory Assets	32,435		29,206
	$	64,314	$	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 December 31, 2021		At September 30, 2021
Accrued Capital Expenditures	$	51,685	$	42,541
Regulatory Liabilities	22,937		60,860
Reserve for Gas Replacement	2,724		—
Liability for Royalty and Working Interests	43,138		31,483
Federal Income Taxes Payable	79		154
Non-Qualified Benefit Plan Liability	15,408		15,408
Other	51,994		43,723
	$	187,965	$	194,169