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Supplementary Information for Exploration and Production Activities (Tables)
 12 Months Ended
Sep. 30, 2025
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
 20252024
 (Thousands)
Proved Properties(1)$7,719,339 $7,079,903 
Unproved Properties112,432 200,986 
7,831,771 7,280,889 
Less — Accumulated Depreciation, Depletion and Amortization5,374,360 5,004,299 
$2,457,411 $2,276,590 
(1)Includes asset retirement costs of $233.9 million and $175.2 million at September 30, 2025 and 2024, respectively.
Summary of Capitalized Costs of Unproved Properties Excluded from Amortization Following is a summary of costs excluded from amortization at September 30, 2025:
 
Total as of
September 30,
2025
Year Costs Incurred
202520242023Prior
 (Thousands)
Acquisition Costs$103,508 $1,277 $8,136 $86,038 $8,057 
Development Costs8,464 6,267 1,077 922 198 
Exploration Costs460 460 — — — 
Capitalized Interest— — — — — 
$112,432 $8,004 $9,213 $86,960 $8,255 
Schedule of Costs Incurred in Property Acquisition, Exploration and Development Activities
Costs Incurred in Property Acquisition, Exploration and Development Activities
 Year Ended September 30
 202520242023
 (Thousands)
United States
Property Acquisition Costs:
Proved$13,680 $17,069 $33,190 
Unproved18,826 19,526 129,061 
Exploration Costs(1)21,562 53,519 10,055 
Development Costs(2)443,311 429,151 553,469 
Asset Retirement Costs58,680 46,017 8,363 
$556,059 $565,282 $734,138 
(1)Amounts for 2025, 2024 and 2023 include capitalized interest of zero, $0.1 million and zero  respectively.
(2)Amounts for 2025, 2024 and 2023 include capitalized interest of zero, $0.7 million and $0.1 million, respectively.
Schedule of Results of Operations for Producing Activities
Results of Operations for Producing Activities
 Year Ended September 30
 202520242023
United States(Thousands, except per Mcfe amounts)
Operating Revenues:
Gas (includes transfers to operations of $1,379, $1,557 and $1,957, respectively)(1)
$1,104,283 $738,778 $1,036,499 
Oil, Condensate and Other Liquids1,837 2,298 2,261 
Total Operating Revenues(2)1,106,120 741,076 1,038,760 
Production/Lifting Costs284,771 270,927 253,555 
Franchise/Ad Valorem Taxes18,267 13,468 17,532 
Accretion Expense7,721 5,992 5,673 
Depreciation, Depletion and Amortization ($0.61, $0.69 and $0.63 per Mcfe of production, respectively)
261,712 270,648 235,694 
Impairment of Exploration and Production Properties108,348 463,692 — 
Income Tax Expense (Benefit)114,502 (76,983)145,574 
Results of Operations for Producing Activities (excluding corporate overheads and interest charges)
$310,799 $(206,668)$380,732 
(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
 U.S.
Appalachian Region
 Gas MMcf Oil Mbbl
Proved Developed and Undeveloped Reserves:
September 30, 20224,170,662   250 
Extensions and Discoveries670,438 (1)— 
Revisions of Previous Estimates32,379 (4)
Production(372,271)(2)(30)
Purchases of Minerals in Place33,876 — 
September 30, 20234,535,084   216 
Extensions and Discoveries601,679 (1)— 
Revisions of Previous Estimates7,046 8 
Production(392,047)(2)(31)
September 30, 20244,751,762   193 
Extensions and Discoveries632,536 (1)— 
Revisions of Previous Estimates22,469   15 
Production(426,357)(2)(28)
September 30, 20254,980,410   180 
Proved Developed Reserves:
September 30, 20223,312,568 250 
September 30, 20233,550,034 216 
September 30, 20243,484,852 193 
September 30, 20253,664,381   180 
Proved Undeveloped Reserves:
September 30, 2022858,094 — 
September 30, 2023985,050 — 
September 30, 20241,266,910 — 
September 30, 20251,316,029   — 
(1)Extensions and discoveries include 163 Bcf (during 2023), 230 Bcf (during 2024) and 0 Bcf (during 2025), of Marcellus Shale gas (which exceed 15% of total reserves) in the Appalachian region. Extensions and discoveries include 507 Bcf (during 2023), 372 Bcf (during 2024) and 633 Bcf (during 2025), of Utica Shale gas (which exceed 15% of total reserves) in the Appalachian region.
(2)Production includes 190,290 MMcf (during 2023), 235,955 MMcf (during 2024) and 209,379 MMcf (during 2025), from Marcellus Shale fields. Production includes 180,750 MMcf (during 2023), 154,701 MMcf (during 2024) and 215,681 MMcf (during 2025), from Utica Shale fields.
Schedule of Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves
 Year Ended September 30
 202520242023
 (Thousands)
United States
Future Cash Inflows$12,243,757 $8,514,126 $11,947,345 
Less:
Future Production Costs3,823,175 3,672,901 3,538,389 
Future Development Costs1,239,386 1,191,708 1,095,096 
Future Income Tax Expense at Applicable Statutory Rate1,719,387 826,094 1,867,457 
Future Net Cash Flows5,461,809 2,823,423 5,446,403 
Less:
10% Annual Discount for Estimated Timing of Cash Flows2,707,425 1,486,968 2,874,295 
Standardized Measure of Discounted Future Net Cash Flows$2,754,384 $1,336,455 $2,572,108 
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
 202520242023
 (Thousands)
United States
Standardized Measure of Discounted Future Net Cash Flows at Beginning of Year$1,336,455 $2,572,108 $5,448,330 
Sales, Net of Production Costs(802,983)(456,506)(767,487)
Net Changes in Prices, Net of Production Costs1,716,936 (1,829,714)(3,918,392)
Extensions and Discoveries330,925 (11,007)237,057 
Changes in Estimated Future Development Costs58,606 32,990 (222,233)
Purchases of Minerals in Place— — 34,346 
Sales of Minerals in Place— — — 
Previously Estimated Development Costs Incurred246,309 305,602 342,024 
Net Change in Income Taxes at Applicable Statutory Rate(467,758)462,075 959,728 
Revisions of Previous Quantity Estimates(7,374)19,216 33,192 
Accretion of Discount and Other343,268 241,691 425,543 
Standardized Measure of Discounted Future Net Cash Flows at End of Year
$2,754,384 $1,336,455 $2,572,108