Business Segment Information (Tables)

6 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Financial Segment Information By Segment

Quarter Ended March 31, 2014 (Thousands)
	Utility	Pipeline and Storage	Exploration and Production	Energy Marketing	Gathering	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$377,647	$53,571	$199,561	$124,439	$195	$755,413	$597	$232	$756,242
Intersegment Revenues	$8,204	$22,235	$—	$5	$15,452	$45,896	$—	$(45,896)	$—
Segment Profit: Net Income	$35,545	$21,372	$24,390	$3,765	$7,324	$92,396	$278	$2,537	$95,211

Six Months Ended March 31, 2014 (Thousands)
	Utility	Pipeline and Storage	Exploration and Production	Energy Marketing	Gathering	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$608,100	$104,784	$392,607	$197,598	$429	$1,303,518	$2,298	$498	$1,306,314
Intersegment Revenues	$12,911	$42,974	$—	$260	$29,802	$85,947	$—	$(85,947)	$—
Segment Profit: Net Income	$59,760	$40,510	$55,487	$5,369	$13,471	$174,597	$954	$1,912	$177,463

(Thousands)	Utility	Pipeline and Storage	Exploration and Production	Energy Marketing	Gathering	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Segment Assets:
At March 31, 2014	$2,019,438	$1,283,654	$2,821,355	$110,285	$247,286	$6,482,018	$95,849	$(10,672)	$6,567,195
At September 30, 2013	$1,870,587	$1,246,027	$2,746,233	$67,267	$203,323	$6,133,437	$95,793	$(10,883)	$6,218,347

Quarter Ended March 31, 2013 (Thousands)
	Utility	Pipeline and Storage	Exploration and Production	Energy Marketing	Gathering	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$303,389	$46,383	$168,080	$78,989	$324	$597,165	$437	$224	$597,826
Intersegment Revenues	$6,396	$23,712	$—	$208	$7,898	$38,214	$—	$(38,214)	$—
Segment Profit: Net Income (Loss)	$34,516	$16,796	$27,711	$4,283	$3,093	$86,399	$(29)	$(650)	$85,720

Six Months Ended March 31, 2013 (Thousands)
	Utility	Pipeline and Storage	Exploration and Production	Energy Marketing	Gathering	Total Reportable Segments	All Other	Corporate and Intersegment Eliminations	Total Consolidated
Revenue from External Customers	$511,953	$89,842	$323,529	$123,154	$526	$1,049,004	$1,252	$424	$1,050,680
Intersegment Revenues	$10,707	$46,509	$—	$634	$13,377	$71,227	$—	$(71,227)	$—
Segment Profit: Net Income (Loss)	$57,394	$33,728	$54,391	$4,778	$5,035	$155,326	$(85)	$(1,577)	$153,664