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Business Segment Information
 12 Months Ended
Sep. 30, 2021
Segment Reporting [Abstract]  
Business Segment Information Business Segment Information
The Company reports financial results for four segments: Exploration and Production, Pipeline and Storage, Gathering, and Utility. The division of the Company’s operations into reportable segments is based upon a combination of factors including differences in products and services, regulatory environment and geographic factors.
The Exploration and Production segment, through Seneca, is engaged in exploration for and development of natural gas and oil reserves in the Appalachian region of the United States and in California.
The Pipeline and Storage segment operations are regulated by the FERC for both Supply Corporation and Empire. Supply Corporation transports and stores natural gas for utilities (including Distribution Corporation), natural gas marketers, exploration and production companies (including Seneca) and pipeline companies in the northeastern United States markets. Empire transports and stores natural gas for major industrial companies, utilities (including Distribution Corporation) and power producers in New York State. Empire also transports natural gas for natural gas marketers and exploration and production companies (including Seneca) from natural gas producing areas in Pennsylvania to markets in New York and to interstate pipeline delivery points with access to additional markets in the northeastern United States and Canada.
The Gathering segment is comprised of Midstream Company’s operations. Midstream Company builds, owns and operates natural gas processing and pipeline gathering facilities in the Appalachian region and currently provides gathering services primarily to Seneca.
The Utility segment operations are regulated by the NYPSC and the PaPUC and are carried out by Distribution Corporation. Distribution Corporation sells natural gas to retail customers and provides natural gas transportation services in western New York and northwestern Pennsylvania.
The data presented in the tables below reflects financial information for the segments and reconciliations to consolidated amounts. The accounting policies of the segments are the same as those described in Note A — Summary of Significant Accounting Policies. Sales of products or services between segments are billed at regulated rates or at market rates, as applicable. The Company evaluates segment performance based on income before discontinued operations (when applicable). When this is not applicable, the Company evaluates performance based on net income. 
 
Year Ended September 30, 2021
 Exploration
and
Production		Pipeline
and
Storage		GatheringUtilityTotal
Reportable
Segments		All
Other		Corporate
and
Intersegment
Eliminations		Total
Consolidated
 (Thousands)
Revenue from External Customers(1)$836,697 $234,397 $3,116 $666,920 $1,741,130 $1,173 $356 $1,742,659 
Intersegment Revenues
$— $109,160 $190,148 $331 $299,639 $49 $(299,688)$— 
Interest Income$211 $1,085 $259 $2,117 $3,672 $230 $486 $4,388 
Interest Expense$69,662 $40,976 $17,493 $21,795 $149,926 $— $(3,569)$146,357 
Depreciation, Depletion and Amortization$182,492 $62,431 $32,350 $57,457 $334,730 $394 $179 $335,303 
Income Tax Expense (Benefit)
$33,370 $28,812 $28,876 $14,007 $105,065 $11,438 $(1,821)$114,682 
Significant Non-Cash Item:
Impairment of Oil and Gas Producing Properties
$76,152 $— $— $— $76,152 $— $— $76,152 
Significant Item:
  Gain on Sale of Timber Properties
$— $— $— $— $— $51,066 $— $51,066 
Segment Profit: Net Income (Loss)
$101,916 $92,542 $80,274 $54,335 $329,067 $37,645 $(3,065)$363,647 
Expenditures for Additions to Long-Lived Assets
$381,408 $252,316 $34,669 $100,845 $769,238 $— $673 $769,911 
 At September 30, 2021
 (Thousands)
Segment Assets$2,286,058 $2,296,030 $837,729 $2,148,267 $7,568,084 $4,146 $(107,405)$7,464,825 
 
 
Year Ended September 30, 2020
 Exploration
and
Production		Pipeline
and
Storage		GatheringUtilityTotal
Reportable
Segments		All
Other		Corporate
and
Intersegment
Elimination		Total
Consolidated
 (Thousands)
Revenue from External Customers(1)
$607,453 $205,998 $72 $642,855 $1,456,378 $89,435 $478 $1,546,291 
Intersegment Revenues
$— $103,606 $142,821 $9,443 $255,870 $836 $(256,706)$— 
Interest Income$698 $1,475 $545 $2,262 $4,980 $860 $(833)$5,007 
Interest Expense$58,098 $32,731 $10,877 $22,150 $123,856 $66 $(6,845)$117,077 
Depreciation, Depletion and Amortization
$172,124 $53,951 $22,440 $55,248 $303,763 $1,716 $679 $306,158 
Income Tax Expense (Benefit)
$(41,472)$28,613 $18,191 $13,274 $18,606 $210 $(77)$18,739 
Significant Non-Cash Item: Impairment of Oil and Gas Producing Properties$449,438 $— $— $— $449,438 $— $— $449,438 
Segment Profit: Net Income (Loss)
$(326,904)$78,860 $68,631 $57,366 $(122,047)$(269)$(1,456)$(123,772)
Expenditures for Additions to Long-Lived Assets
$670,455 $166,652 $297,806 $94,273 $1,229,186 $39 $(608)$1,228,617 
 At September 30, 2020
 (Thousands)
Segment Assets$1,979,028 $2,204,971 $945,199 $2,067,852 $7,197,050 $113,571 $(345,686)$6,964,935 
 
 
Year Ended September 30, 2019
 Exploration
and
Production		Pipeline
and
Storage		GatheringUtilityTotal
Reportable
Segments		All
Other		 Corporate
and
Intersegment
Eliminations		Total
Consolidated
 (Thousands)
Revenue from External Customers(1)
$632,740 $195,808 $11 $715,813 $1,544,372 $148,582 $378 $1,693,332 
Intersegment Revenues
$— $92,475 $127,064 $11,629 $231,168 $1,127 $(232,295)$— 
Interest Income$1,107 $2,982 $546 $1,809 $6,444 $1,291 $(1,670)$6,065 
Interest Expense$54,777 $29,142 $9,406 $23,443 $116,768 $21 $(10,033)$106,756 
Depreciation, Depletion and Amortization
$154,784 $44,947 $20,038 $53,832 $273,601 $1,291 $768 $275,660 
Income Tax Expense (Benefit)
$32,978 $23,238 $20,895 $13,967 $91,078 $(955)$(4,902)$85,221 
Segment Profit: Net Income (Loss)
$111,807 $74,011 $58,413 $60,871 $305,102 $(1,811)$999 $304,290 
Expenditures for Additions to Long-Lived Assets
$491,889 $143,005 $49,650 $95,847 $780,391 $128 $727 $781,246 
 At September 30, 2019
 (Thousands)
Segment Assets$1,972,776 $1,893,514 $547,995 $1,991,338 $6,405,623 $122,241 $(65,707)$6,462,157 
(1)All Revenue from External Customers originated in the United States.
Geographic InformationAt September 30
 202120202019
 (Thousands)
Long-Lived Assets:
United States$6,942,376 $6,597,313 $6,099,534