Revenue from Contracts with Customers (Tables)

6 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Summary of Disaggregation of Revenue

The following table presents our disaggregated revenues by reportable segment for the three and six months ended March 31, 2019:

	Three Months Ended March 31, 2019								Six Months Ended March 31, 2019
	Total			Gas Utility			Electric Utility		Total			Gas Utility			Electric Utility
Revenues from contracts with customers:
Core Market:
Residential	$	240,316		$	220,728		$	19,588	$	416,007		$	379,285		$	36,722
Commercial & industrial	100,686			94,412			6,274		168,260			155,787			12,473
Large delivery service	44,038			44,038			—		83,585			83,585			—
Off-system sales and capacity releases	46,403			46,403			—		84,534			84,534			—
Other (a)	(2,446		)	(4,761		)	2,315		(1,275		)	(5,840		)	4,565
Total revenues from contracts with customers	428,997			400,820			28,177		751,111			697,351			53,760
Other revenues (b)	595			595			—		1,206			1,206			—
Total revenues	$	429,592		$	401,415		$	28,177	$	752,317		$	698,557		$	53,760