Business Segment Information (Tables)

12 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment Information By Segment

	Year Ended September 30, 2021
	Exploration and Production		Pipeline and Storage		Gathering		Utility		Total 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		Gathering		Utility		Total 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		Gathering		Utility		Total 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.

Schedule Of Long-Lived Assets, By Geographical Areas

Geographic Information	At September 30
	2021		2020		2019
	(Thousands)
Long-Lived Assets:
United States	$	6,942,376	$	6,597,313	$	6,099,534