Segment Information (Tables)

12 Months Ended

Sep. 30, 2018

Segment Reporting [Abstract]

Segment Information

Financial information by business segment follows:

	Total		Gas Utility		Electric Utility
2018
Revenues	$	1,092,381	$	994,814	$	97,567
Cost of sales	$	522,911	$	467,528	$	55,383
Depreciation	$	84,644	$	79,124	$	5,520
Operating income	$	237,522	$	230,430	$	7,092
Interest expense	$	42,890	$	41,414	$	1,476
Income before income taxes	$	194,632	$	189,016	$	5,616
Total assets	$	3,266,576	$	3,075,992	$	190,584
Goodwill	$	182,145	$	182,145	$	—
Capital expenditures (including the effects of accruals)	$	338,548	$	320,018	$	18,530
2017
Revenues	$	887,588	$	799,054	$	88,534
Cost of sales	$	367,279	$	318,210	$	49,069
Depreciation	$	72,332	$	67,357	$	4,975
Operating income	$	228,307	$	219,561	$	8,746
Interest expense	$	40,212	$	38,218	$	1,994
Income before income taxes	$	188,095	$	181,343	$	6,752
Total assets	$	2,994,015	$	2,833,423	$	160,592
Goodwill	$	182,145	$	182,145	$	—
Capital expenditures (including the effects of accruals)	$	317,722	$	306,243	$	11,479
2016
Revenues	$	768,484	$	677,387	$	91,097
Cost of sales	$	289,786	$	239,163	$	50,623
Depreciation	$	67,303	$	62,451	$	4,852
Operating income	$	200,901	$	189,412	$	11,489
Interest expense	$	37,630	$	35,786	$	1,844
Income before income taxes	$	163,271	$	153,626	$	9,645
Total assets	$	2,743,091	$	2,570,297	$	172,794
Goodwill	$	182,145	$	182,145	$	—
Capital expenditures (including the effects of accruals)	$	262,503	$	251,261	$	11,242