Business Segment Information (Tables)

6 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Financial Segment Information By Segment

Quarter Ended March 31, 2024 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$264,614	$71,210	$3,917	$290,198	$629,939	$—	$—	$629,939
Intersegment Revenues	$—	$36,810	$60,076	$306	$97,192	$—	$(97,192)	$—
Segment Profit: Net Income (Loss)	$62,065	$30,737	$28,706	$44,739	$166,247	$(96)	$121	$166,272

Six Months Ended March 31, 2024 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$518,633	$136,036	$8,513	$492,119	$1,155,301	$—	$—	$1,155,301
Intersegment Revenues	$—	$66,397	$118,068	$393	$184,858	$—	$(184,858)	$—
Segment Profit: Net Income (Loss)	$114,548	$54,792	$57,531	$71,289	$298,160	$(217)	$1,349	$299,292

(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, 2024	$3,049,670	$2,472,011	$971,741	$2,359,961	$8,853,383	$4,823	$(181,181)	$8,677,025
At September 30, 2023	$2,814,218	$2,427,214	$912,923	$2,247,743	$8,402,098	$4,795	$(126,633)	$8,280,260

Quarter Ended March 31, 2023 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$244,552	$64,223	$1,728	$406,758	$717,261	$—	$—	$717,261
Intersegment Revenues	$—	$30,880	$55,253	$358	$86,491	$—	$(86,491)	$—
Segment Profit: Net Income (Loss)	$60,982	$23,858	$24,334	$31,720	$140,894	$(69)	$55	$140,880

Six Months Ended March 31, 2023 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$521,525	$131,844	$4,374	$718,376	$1,376,119	$—	$—	$1,376,119
Intersegment Revenues	$—	$60,915	$109,020	$420	$170,355	$—	$(170,355)	$—
Segment Profit: Net Income (Loss)	$152,174	$53,335	$49,072	$55,537	$310,118	$(350)	$802	$310,570