Business Segment Information (Tables)

6 Months Ended

Mar. 31, 2021

Segment Reporting [Abstract]

Financial Segment Information By Segment

Quarter Ended March 31, 2021 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$220,187	$59,314	$671	$270,784	$550,956	$64	$95	$551,115
Intersegment Revenues	$—	$27,390	$49,591	$97	$77,078	$1	$(77,079)	$—
Segment Profit: Net Income (Loss)	$36,822	$24,928	$20,700	$32,044	$114,494	$(983)	$(1,075)	$112,436

Six Months Ended March 31, 2021 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$411,582	$118,623	$1,021	$459,684	$990,910	$1,175	$190	$992,275
Intersegment Revenues	$—	$55,846	$96,249	$197	$152,292	$20	$(152,312)	$—
Segment Profit: Net Income	$7,199	$49,112	$41,250	$55,081	$152,642	$36,577	$991	$190,210

(Thousands)	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Segment Assets:
At March 31, 2021	$2,023,147	$2,240,140	$855,507	$2,151,304	$7,270,098	$27,391	$(181,837)	$7,115,652
At September 30, 2020	$1,979,028	$2,204,971	$945,199	$2,067,852	$7,197,050	$113,571	$(345,686)	$6,964,935

Quarter Ended March 31, 2020 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$155,560	$51,919	$—	$250,556	$458,035	$32,925	$135	$491,095
Intersegment Revenues	$—	$27,326	$35,267	$3,937	$66,530	$79	$(66,609)	$—
Segment Profit: Net Income (Loss)	$(175,275)	$22,087	$19,898	$31,499	$(101,791)	$1,169	$(5,446)	$(106,068)

Six Months Ended March 31, 2020 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$321,499	$100,888	$—	$445,465	$867,852	$67,161	$270	$935,283
Intersegment Revenues	$—	$50,577	$70,055	$5,853	$126,485	$256	$(126,741)	$—
Segment Profit: Net Income (Loss)	$(151,299)	$40,192	$35,842	$58,082	$(17,183)	$1,540	$(3,834)	$(19,477)