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Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2022
Accounting Policies [Abstract]  
Schedule of Allowance for Uncollectible Accounts
Activity in the allowance for uncollectible accounts are as follows:
 Year Ended September 30
 202220212020
 (Thousands)
Balance at Beginning of Year$31,639 $22,810 $25,788 
Additions Charged to Costs and Expenses13,209 14,940 12,339 
Add: Discounts on Purchased Receivables1,314 1,168 1,353 
Deduct: Net Accounts Receivable Written-Off5,934 7,279 16,670 
Balance at End of Year$40,228 $31,639 $22,810 
Schedule Of Depreciable Plant By Segment The following is a summary of depreciable plant by segment:
 As of September 30
 20222021
 (Thousands)
Exploration and Production$6,088,476 $6,827,122 
Pipeline and Storage2,747,948 2,467,891 
Gathering971,665 932,583 
Utility2,411,707 2,306,603 
All Other and Corporate13,712 13,585 
$12,233,508 $12,547,784 
Average Depreciation Depletion And Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 Year Ended September 30
 202220212020
Exploration and Production, per Mcfe(1)$0.59 $0.56 $0.71 
Pipeline and Storage2.7 %2.6 %2.4 %
Gathering3.6 %3.6 %3.2 %
Utility2.7 %2.7 %2.7 %
All Other and Corporate1.4 %3.4 %3.6 %
(1)Amounts include depletion of oil and gas producing properties as well as depreciation of fixed assets. As disclosed in Note N — Supplementary Information for Oil and Gas Producing Activities, depletion of oil and gas producing properties amounted to $0.57, $0.54 and $0.69 per Mcfe of production in 2022, 2021 and 2020, respectively.
Components Of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Income (Loss) and changes for the years ended September 30, 2022 and 2021, net of related tax effects, are as follows (amounts in parentheses indicate debits) (in thousands):
 Gains and Losses on Derivative Financial InstrumentsFunded Status of the Pension and Other Post-Retirement Benefit PlansTotal
Year Ended September 30, 2022
Balance at October 1, 2021
$(449,962)$(63,635)$(513,597)
Other Comprehensive Gains and Losses Before Reclassifications(763,223)7,392 (755,831)
Amounts Reclassified From Other Comprehensive Income (Loss)641,022 8,480 649,502 
Other Post-Retirement Adjustment for Regulatory Proceeding— (5,807)(5,807)
Balance at September 30, 2022
$(572,163)$(53,570)$(625,733)
Year Ended September 30, 2021
Balance at October 1, 2020
$(24,865)$(89,892)$(114,757)
Other Comprehensive Gains and Losses Before Reclassifications(486,343)13,790 (472,553)
Amounts Reclassified From Other Comprehensive Income (Loss)61,246 12,467 73,713 
Balance at September 30, 2021
$(449,962)$(63,635)$(513,597)
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 years ended September 30, 2022 and 2021 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) for the
Year Ended
September 30,		Affected Line Item in the Statement Where Net Income is Presented
20222021
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts
($882,594)($83,973)Operating Revenues
Foreign Currency Contracts
13 262 Operating Revenues
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
Prior Service Cost
(103)(208)(1)
Net Actuarial Loss
(10,951)(16,021)(1)
 (893,635)(99,940)Total Before Income Tax
 244,133 26,227 Income Tax Expense
 ($649,502)($73,713)Net of Tax
(1)These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost. Refer to Note K — Retirement Plan and Other Post-Retirement Benefits for additional details.
Schedule of Materials, Supplies and Emission Allowances
The components of the Company's materials, supplies and emission allowances are as follows:
Year Ended September 30
20222021
(Thousands)
Materials and Supplies — at average cost
$40,637 $34,880 
Emission Allowances— 18,680 
$40,637 $53,560 
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):
 Year Ended September 30
 2022202120202019
Cash and Temporary Cash Investments$46,048 $31,528 $20,541 $20,428 
Hedging Collateral Deposits91,670 88,610 — 6,832 
Cash, Cash Equivalents, and Restricted Cash$137,718 $120,138 $20,541 $27,260 
Schedule Of Other Current Assets
The components of the Company’s Other Current Assets are as follows: 
 Year Ended September 30
20222021
 (Thousands)
Prepayments$17,757 $14,164 
Prepaid Property and Other Taxes14,321 14,788 
State Income Taxes Receivable5,933 1,502 
Regulatory Assets21,358 29,206 
$59,369 $59,660 
Schedule of Other Accruals And Current Liabilities
The components of the Company’s Other Accruals and Current Liabilities are as follows:
 Year Ended September 30
 20222021
 (Thousands)
Accrued Capital Expenditures$64,720 $42,541 
Regulatory Liabilities31,293 60,860 
Liability for Royalty and Working Interests86,206 31,483 
Non-Qualified Benefit Plan Liability17,474 15,408 
Other57,634 43,877 
$257,327 $194,169