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Summary Of Significant Accounting Policies (Tables)
 3 Months Ended
Dec. 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):
Three Months Ended
 December 31, 2022		Three Months Ended
 December 31, 2021
 Balance at
December 31, 2022		Balance at October 1, 2022Balance at
December 31, 2021		Balance at October 1, 2021
Cash and Temporary Cash Investments$244,475 $46,048 $79,065 $31,528 
Hedging Collateral Deposits1,600 91,670 — 88,610 
Cash, Cash Equivalents, and Restricted Cash$246,075 $137,718 $79,065 $120,138 
Schedule of Allowance for Uncollectible Accounts Activity in the allowance for uncollectible accounts for the three months ended December 31, 2022 and 2021 are as follows (in thousands):
Balance at Beginning of PeriodAdditions Charged to Costs and ExpensesDiscounts on Purchased ReceivablesNet Accounts Receivable Recovered (Written-Off)Balance at End of Period
Three Months Ended December 31, 2022
Allowance for Uncollectible Accounts$40,228 $5,035 $228 $(1,566)$43,925 
Three Months Ended December 31, 2021
Allowance for Uncollectible Accounts$31,639 $3,742 $161 $57 $35,599 
Components of Accumulated Other Comprehensive Loss The components of Accumulated Other Comprehensive Loss and changes for the three months ended December 31, 2022 and 2021, net of related tax effect, are as follows (amounts in parentheses indicate debits) (in thousands): 
 Gains and Losses on Derivative Financial InstrumentsFunded Status of the Pension and Other Post-Retirement Benefit PlansTotal
Three Months Ended December 31, 2022
Balance at October 1, 2022$(572,163)$(53,570)$(625,733)
Other Comprehensive Gains and Losses Before Reclassifications
216,216 — 216,216 
Amounts Reclassified From Other Comprehensive Income115,771 — 115,771 
Balance at December 31, 2022$(240,176)$(53,570)$(293,746)
Three Months Ended December 31, 2021
Balance at October 1, 2021$(449,962)$(63,635)$(513,597)
Other Comprehensive Gains and Losses Before Reclassifications
118,483 — 118,483 
Amounts Reclassified From Other Comprehensive Income118,088 — 118,088 
Balance at December 31, 2021$(213,391)$(63,635)$(277,026)
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, 2022 and 2021 are as follows (amounts in parentheses indicate debits to the income statement) (in thousands):
Details About Accumulated Other Comprehensive Loss ComponentsAmount of Gain or (Loss) Reclassified from Accumulated Other Comprehensive LossAffected Line Item in the Statement Where Net Income is Presented
Three Months Ended
December 31,
20222021
Gains (Losses) on Derivative Financial Instrument Cash Flow Hedges:
 
     Commodity Contracts($159,162)($162,629)Operating Revenues
     Foreign Currency Contracts(180)41 Operating Revenues
 (159,342)(162,588)Total Before Income Tax
 43,571 44,500 Income Tax Expense
 ($115,771)($118,088)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, 2022At September 30, 2022
Prepayments$19,828 $17,757 
Prepaid Property and Other Taxes14,564 14,321 
Prepaid State Income Taxes5,608 5,933 
Regulatory Assets21,117 21,358 
 $61,117 $59,369 
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, 2022At September 30, 2022
Accrued Capital Expenditures$71,421 $64,720 
Regulatory Liabilities32,357 31,293 
Reserve for Gas Replacement17,695 — 
Liability for Royalty and Working Interests43,122 86,206 
Non-Qualified Benefit Plan Liability17,474 17,474 
Other57,028 57,634 
 $239,097 $257,327