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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2023
Accounting Policies [Abstract]  
Schedule of Allowance for Uncollectible Accounts
Activity in the allowance for uncollectible accounts are as follows:
 Year Ended September 30
 202320222021
 (Thousands)
Balance at Beginning of Year$40,228 $31,639 $22,810 
Additions Charged to Costs and Expenses14,482 13,209 14,940 
Add: Discounts on Purchased Receivables1,380 1,314 1,168 
Deduct: Net Accounts Receivable Written-Off19,795 5,934 7,279 
Balance at End of Year$36,295 $40,228 $31,639 
Schedule of Depreciable Plant By Segment The following is a summary of depreciable plant by segment:
 As of September 30
 20232022
 (Thousands)
Exploration and Production$6,741,095 $6,088,476 
Pipeline and Storage2,803,690 2,747,948 
Gathering1,032,969 971,665 
Utility2,507,465 2,411,707 
All Other and Corporate15,787 13,712 
$13,101,006 $12,233,508 
Average Depreciation, Depletion and Amortization Rates
Average depreciation, depletion and amortization rates are as follows:
 Year Ended September 30
 202320222021
Exploration and Production, per Mcfe(1)$0.65 $0.59 $0.56 
Pipeline and Storage2.6 %2.7 %2.6 %
Gathering3.6 %3.6 %3.6 %
Utility2.7 %2.7 %2.7 %
All Other and Corporate2.9 %1.4 %3.4 %
(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 $0.63, $0.57 and $0.54 per Mcfe of production in 2023, 2022 and 2021, respectively.
Components of Accumulated Other Comprehensive Income (Loss)
The components of Accumulated Other Comprehensive Loss and changes for the years ended September 30, 2023 and 2022, 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, 2023
Balance at October 1, 2022
$(572,163)$(53,570)$(625,733)
Other Comprehensive Gains and Losses Before Reclassifications493,936 (7,376)486,560 
Amounts Reclassified From Other Comprehensive Loss82,850 1,263 84,113 
Balance at September 30, 2023
$4,623 $(59,683)$(55,060)
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 Loss641,022 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)
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
The details about the reclassification adjustments out of accumulated other comprehensive loss for the years ended September 30, 2023 and 2022 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
 for the
Year Ended
September 30,		Affected Line Item in the Statement Where Net Income is Presented
20232022
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
Commodity Contracts
$(88,015)$(882,594)Operating Revenues
Foreign Currency Contracts
(641)13 Operating Revenues
Amortization of Prior Year Funded Status of the Pension and Other Post-Retirement Benefit Plans:
Prior Service Cost
(82)(103)(1)
Net Actuarial Loss
(1,592)(10,951)(1)
 (90,330)(893,635)Total Before Income Tax
 6,217 244,133 Income Tax Expense
 $(84,113)$(649,502)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 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
 2023202220212020
Cash and Temporary Cash Investments$55,447 $46,048 $31,528 $20,541 
Hedging Collateral Deposits— 91,670 88,610 — 
Cash, Cash Equivalents, and Restricted Cash$55,447 $137,718 $120,138 $20,541 
Schedule of Other Current Assets
The components of the Company’s Other Current Assets are as follows: 
 Year Ended September 30
20232022
 (Thousands)
Prepayments$18,966 $17,757 
Prepaid Property and Other Taxes14,186 14,321 
Federal Income Taxes Receivable14,602 — 
State Income Taxes Receivable16,133 5,933 
Regulatory Assets36,373 21,358 
$100,260 $59,369 
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
 20232022
 (Thousands)
Accrued Capital Expenditures$43,323 $64,720 
Regulatory Liabilities38,105 31,293 
Liability for Royalty and Working Interests17,679 86,206 
Non-Qualified Benefit Plan Liability13,052 17,474 
Other48,815 57,634 
$160,974 $257,327