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Supplementary Information for Exploration and Production Activities (Tables)
 12 Months Ended
Sep. 30, 2024
Supplementary Information for Exploration and Production Activities Unaudited [Abstract]  
Schedule of Capitalized Costs Relating to Exploration and Production Activities
Capitalized Costs Relating to Exploration and Production Activities
 At September 30
 20242023
 (Thousands)
Proved Properties(1)$7,079,903 $6,555,088 
Unproved Properties200,986 161,097 
7,280,889 6,716,185 
Less — Accumulated Depreciation, Depletion and Amortization5,004,299 4,269,959 
$2,276,590 $2,446,226 
(1)Includes asset retirement costs of $175.2 million and $129.2 million at September 30, 2024 and 2023, respectively.
Summary of Capitalized Costs of Unproved Properties Excluded from Amortization Following is a summary of costs excluded from amortization at September 30, 2024:
 
Total as of
September 30,
2024
Year Costs Incurred
202420232022Prior
 (Thousands)
Acquisition Costs$140,753 $8,136 $104,858 $2,072 $25,687 
Development Costs48,642 46,597 1,821 185 39 
Exploration Costs10,813 10,813 — — — 
Capitalized Interest778 778 — — — 
$200,986 $66,324 $106,679 $2,257 $25,726 
Schedule of Costs Incurred in Property Acquisition, Exploration and Development Activities
Costs Incurred in Property Acquisition, Exploration and Development Activities
 Year Ended September 30
 202420232022
 (Thousands)
United States
Property Acquisition Costs:
Proved$17,069 $33,190 $2,491 
Unproved19,526 129,061 10,665 
Exploration Costs(1)53,519 10,055 9,631 
Development Costs(2)429,151 553,469 528,684 
Asset Retirement Costs46,017 8,363 9,768 
$565,282 $734,138 $561,239 
(1)Amounts for 2024, 2023 and 2022 include capitalized interest of $0.1 million, zero and zero  respectively.
(2)Amounts for 2024, 2023 and 2022 include capitalized interest of $0.7 million, $0.1 million and $0.6 million, respectively.
Schedule of Results of Operations for Producing Activities
Results of Operations for Producing Activities
 Year Ended September 30
 202420232022
United States(Thousands, except per Mcfe amounts)
Operating Revenues:
Gas (includes transfers to operations of $1,557, $1,957 and $5,696, respectively)(1)
$738,778 $1,036,499 $1,730,723 
Oil, Condensate and Other Liquids2,298 2,261 150,957 
Total Operating Revenues(2)741,076 1,038,760 1,881,680 
Production/Lifting Costs270,927 253,555 283,914 
Franchise/Ad Valorem Taxes13,468 17,532 25,112 
Purchased Emission Allowance Expense— — 1,305 
Accretion Expense5,992 5,673 7,530 
Depreciation, Depletion and Amortization ($0.69, $0.63 and $0.57 per Mcfe of production, respectively)
270,648 235,694 202,418 
Impairment of Exploration and Production Properties463,692 — — 
Income Tax Expense (Benefit)(76,983)145,574 368,925 
Results of Operations for Producing Activities (excluding corporate overheads and interest charges)
$(206,668)$380,732 $992,476 
(1)There were no revenues from sales to affiliates for all years presented.
(2)Exclusive of hedging gains and losses. See further discussion in Note J — Financial Instruments.
Schedule of Proved Developed and Undeveloped Gas and Oil Reserve Quantities
 Gas MMcf
 U.S. 
 Appalachian
Region		 West Coast
Region		Total
Company
Proved Developed and Undeveloped Reserves:
September 30, 20213,693,148   30,285 3,723,433 
Extensions and Discoveries837,510 (1)— 837,510 
Revisions of Previous Estimates2,882 71 2,953 
Production(341,700)(2)(1,211)(342,911)
Sale of Minerals in Place(21,178)(29,145)(50,323)
September 30, 20224,170,662   — 4,170,662 
Extensions and Discoveries670,438 (1)— 670,438 
Revisions of Previous Estimates32,379 — 32,379 
Production(372,271)(2)— (372,271)
Purchases of Minerals in Place33,876 — 33,876 
September 30, 20234,535,084   — 4,535,084 
Extensions and Discoveries601,679 (1)— 601,679 
Revisions of Previous Estimates7,046   — 7,046 
Production(392,047)(2)— (392,047)
September 30, 20244,751,762   — 4,751,762 
Proved Developed Reserves:
September 30, 20213,061,178 30,285 3,091,463 
September 30, 20223,312,568 — 3,312,568 
September 30, 20233,550,034 — 3,550,034 
September 30, 20243,484,852   — 3,484,852 
Proved Undeveloped Reserves:
September 30, 2021631,970 — 631,970 
September 30, 2022858,094 — 858,094 
September 30, 2023985,050 — 985,050 
September 30, 20241,266,910   — 1,266,910 
(1)Extensions and discoveries include 301 Bcf (during 2022), 163 Bcf (during 2023) and 230 Bcf (during 2024), of Marcellus Shale gas (which exceed 15% of total reserves) in the Appalachian region. Extensions and discoveries include 537 Bcf (during 2022), 507 Bcf (during 2023) and 372 Bcf (during 2024), of Utica Shale gas (which exceed 15% of total reserves) in the Appalachian region.
(2)Production includes 209,463 MMcf (during 2022), 190,290 MMcf (during 2023) and 235,955 MMcf (during 2024), from Marcellus Shale fields. Production includes 130,240 MMcf (during 2022), 180,750 MMcf (during 2023) and 154,701 MMcf (during 2024), from Utica Shale fields.
 Oil Mbbl
 U.S. 
 Appalachian
Region		West Coast
Region		Total
Company
Proved Developed and Undeveloped Reserves:
September 30, 202111 21,526 21,537 
Extensions and Discoveries— 296 296 
Revisions of Previous Estimates255 532 787 
Production(16)(1,588)(1,604)
Sales of Minerals in Place— (20,766)(20,766)
September 30, 2022250 — 250 
Revisions of Previous Estimates(4)— (4)
Production(30)— (30)
September 30, 2023216 — 216 
Revisions of Previous Estimates8 — 8 
Production(31)— (31)
September 30, 2024193 — 193 
Proved Developed Reserves:
September 30, 202111 20,930 20,941 
September 30, 2022250 — 250 
September 30, 2023216 — 216 
September 30, 2024193 — 193 
Proved Undeveloped Reserves:
September 30, 2021— 596 596 
September 30, 2022— — — 
September 30, 2023— — — 
September 30, 2024— — — 
Schedule of Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves
 Year Ended September 30
 202420232022
 (Thousands)
United States
Future Cash Inflows$8,514,126 $11,947,345 $19,209,099 
Less:
Future Production Costs3,672,901 3,538,389 3,138,226 
Future Development Costs1,191,708 1,095,096 781,847 
Future Income Tax Expense at Applicable Statutory Rate826,094 1,867,457 3,876,272 
Future Net Cash Flows2,823,423 5,446,403 11,412,754 
Less:
10% Annual Discount for Estimated Timing of Cash Flows1,486,968 2,874,295 5,964,424 
Standardized Measure of Discounted Future Net Cash Flows$1,336,455 $2,572,108 $5,448,330 
Schedule of Principal Sources of Change in the Standardized Measure of Discounted Future Net Cash Flows
The principal sources of change in the standardized measure of discounted future net cash flows were as follows:
 Year Ended September 30
 202420232022
 (Thousands)
United States
Standardized Measure of Discounted Future Net Cash Flows at Beginning of Year$2,572,108 $5,448,330 $2,353,572 
Sales, Net of Production Costs(456,506)(767,487)(1,572,402)
Net Changes in Prices, Net of Production Costs(1,829,714)(3,918,392)4,132,889 
Extensions and Discoveries(11,007)237,057 1,355,257 
Changes in Estimated Future Development Costs32,990 (222,233)(32,160)
Purchases of Minerals in Place— 34,346 — 
Sales of Minerals in Place— — (311,308)
Previously Estimated Development Costs Incurred305,602 342,024 154,253 
Net Change in Income Taxes at Applicable Statutory Rate462,075 959,728 (1,180,349)
Revisions of Previous Quantity Estimates19,216 33,192 3,316 
Accretion of Discount and Other241,691 425,543 545,262 
Standardized Measure of Discounted Future Net Cash Flows at End of Year
$1,336,455 $2,572,108 $5,448,330