Segment Information (Tables)

9 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segment Information

Financial information by business segment follows:

Three Months Ended June 30, 2013:

			Reportable Segments
	Total		Gas Utility		Electric Utility		Other
Revenues	$	148,798	$	126,725	$	21,535	$	538
Cost of sales	$	64,332	$	52,365	$	11,967	$	—
Depreciation and amortization	$	14,033	$	13,012	$	1,021	$	—
Operating income	$	18,878	$	16,054	$	2,584	$	240
Interest expense	$	9,690	$	9,172	$	518	$	—
Income before income taxes	$	9,188	$	6,882	$	2,066	$	240
Total assets (at period end)	$	2,328,056	$	2,164,435	$	163,621	$	—
Goodwill (at period end)	$	182,145	$	182,145	$	—	$	—
Capital expenditures	$	38,961	$	37,224	$	1,737	$	—

Three Months Ended June 30, 2012:

			Reportable Segments
	Total		Gas Utility		Electric Utility		Other
Revenues	$	143,644	$	122,273	$	20,779	$	592
Cost of sales	$	62,701	$	51,401	$	11,300	$	—
Depreciation and amortization	$	13,251	$	12,332	$	919	$	—
Operating income	$	25,300	$	22,535	$	2,554	$	211
Interest expense	$	10,575	$	9,965	$	610	$	—
Income before income taxes	$	14,725	$	12,570	$	1,944	$	211
Total assets (at period end)	$	2,185,845	$	2,027,023	$	158,822	$	—
Goodwill (at period end)	$	182,145	$	182,145	$	—	$	—
Capital expenditures	$	29,914	$	29,004	$	910	$	—

Nine Months Ended June 30, 2013:

			Reportable Segments
	Total		Gas Utility		Electric Utility		Other
Revenues	$	818,496	$	743,614	$	73,604	$	1,278
Cost of sales	$	415,394	$	372,681	$	42,713	$	—
Depreciation and amortization	$	41,316	$	38,348	$	2,968	$	—
Operating income	$	200,672	$	191,592	$	8,597	$	483
Interest expense	$	29,587	$	28,071	$	1,516	$	—
Income before income taxes	$	171,085	$	163,521	$	7,081	$	483
Total assets (at period end)	$	2,328,056	$	2,164,435	$	163,621	$	—
Goodwill (at period end)	$	182,145	$	182,145	$	—	$	—
Capital expenditures	$	94,480	$	90,173	$	4,307	$	—

Nine Months Ended June 30, 2012:

			Reportable Segments
	Total		Gas Utility		Electric Utility		Other
Revenues	$	770,087	$	696,814	$	71,888	$	1,385
Cost of sales	$	412,377	$	370,572	$	41,805	$	—
Depreciation and amortization	$	39,424	$	36,635	$	2,789	$	—
Operating income	$	178,352	$	168,735	$	9,147	$	470
Interest expense	$	31,859	$	30,148	$	1,711	$	—
Income before income taxes	$	146,493	$	138,587	$	7,436	$	470
Total assets (at period end)	$	2,185,845	$	2,027,023	$	158,822	$	—
Goodwill (at period end)	$	182,145	$	182,145	$	—	$	—
Capital expenditures	$	79,698	$	76,470	$	3,228	$	—