Business Segment Information (Tables)

3 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Financial Segment Information By Segment

Quarter Ended December 31, 2017 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Energy Marketing	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$139,141	$53,310	$170	$187,089	$38,636	$418,346	$1,096	$213	$419,655
Intersegment Revenues	$—	$21,985	$23,665	$2,182	$126	$47,958	$—	$(47,958)	$—
Segment Profit: Net Income (Loss)	$106,698	$38,462	$45,400	$20,993	$1,046	$212,599	$(719)	$(13,226)	$198,654

(Thousands)	Exploration and Production	Pipeline and Storage	Gathering	Utility	Energy Marketing	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Segment Assets:
At December 31, 2017	$1,420,790	$1,793,848	$589,793	$1,988,758	$72,466	$5,865,655	$77,214	$(150,937)	$5,791,932
At September 30, 2017	$1,407,152	$1,929,788	$580,051	$2,013,123	$60,937	$5,991,051	$76,861	$35,408	$6,103,320

Quarter Ended December 31, 2016 (Thousands)
	Exploration and Production	Pipeline and Storage	Gathering	Utility	Energy Marketing	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$160,932	$53,000	$26	$170,971	$36,809	$421,738	$554	$208	$422,500
Intersegment Revenues	$—	$22,155	$27,840	$1,826	$19	$51,840	$—	$(51,840)	$—
Segment Profit: Net Income (Loss)	$35,080	$19,368	$10,981	$21,175	$1,782	$88,386	$(179)	$701	$88,908