Summary Of Significant Accounting Policies (Tables)

3 Months Ended

Dec. 31, 2020

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, 2020				Three Months Ended December 31, 2019
	Balance at October 1, 2020		Balance at December 31, 2020		Balance at October 1, 2019		Balance at December 31, 2019
Cash and Temporary Cash Investments	$	20,541	$	109,413	$	20,428	$	34,966
Hedging Collateral Deposits	—		—		6,832		9,666
Cash, Cash Equivalents, and Restricted Cash	$	20,541	$	109,413	$	27,260	$	44,632

Schedule of Allowance for Uncollectible Accounts

Activity in the allowance for uncollectible accounts for the three months ended December 31, 2020 are as follows:

	Balance at Beginning of Period		Additions Charged to Costs and Expenses		Add: Discounts on Purchased Receivables		Deduct: Net Accounts Receivable Written-Off		Balance at End of Period
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:

	At December 31, 2020		At September 30, 2020
Materials and Supplies - at average cost	$	33,676	$	33,859
Emission Allowances	18,018		18,018
	$	51,694	$	51,877

Components of Accumulated Other Comprehensive Income (Loss)

The components of Accumulated Other Comprehensive Income (Loss) and changes for the three months ended December 31, 2020 and 2019, 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, 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 (Loss)	225		—		225
Balance at December 31, 2020	$	10,151	$	(89,892)	$	(79,741)
Three Months Ended December 31, 2019
Balance at October 1, 2019	$	34,675	$	(86,830)	$	(52,155)
Other Comprehensive Gains and Losses Before Reclassifications	376		—		376
Amounts Reclassified From Other Comprehensive Income (Loss)	(5,321)		—		(5,321)
Cumulative Effect of Adoption of Authoritative Guidance for Hedging	950		—		950
Balance at December 31, 2019	$	30,680	$	(86,830)	$	(56,150)

Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)

The details about the reclassification adjustments out of accumulated other comprehensive income (loss) for the three months ended December 31, 2020 and 2019 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):

Details About Accumulated Other Comprehensive Income (Loss) Components	Amount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss)		Affected Line Item in the Statement Where Net Income is Presented
	Three Months Ended December 31,
	2020	2019
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts	($310)	$7,541	Operating Revenues
Commodity Contracts	—	2	Purchased Gas
Foreign Currency Contracts	(1)	(191)	Operating Revenues
	(311)	7,352	Total Before Income Tax
	86	(2,031)	Income Tax Expense
	($225)	$5,321	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, 2020		At September 30, 2020
Prepayments	$	10,203	$	12,851
Prepaid Property and Other Taxes	14,821		14,269
State Income Taxes Receivable	1,439		3,828
Regulatory Assets	21,441		16,609
	$	47,904	$	47,557

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, 2020		At September 30, 2020
Accrued Capital Expenditures	$	34,840	$	33,344
Regulatory Liabilities	41,402		44,890
Reserve for Gas Replacement	1,778		—
Liability for Royalty and Working Interests	22,869		15,665
Non-Qualified Benefit Plan Liability	14,460		14,460
Other	39,028		31,817
	$	154,377	$	140,176