CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
OPERATING REVENUES
Utility	$ 731,459	$ 729,923	$ 710,793
Nonutility	1,425,154	1,223,745	1,881,252
Total operating revenues	2,156,613	1,953,668	2,592,045
Natural gas purchases:
Related parties	7,013	6,083	7,948
Operation and maintenance	366,905	278,143	268,141
Regulatory rider expenses	38,304	34,529	33,937
Depreciation and amortization	111,387	107,368	81,109
Total operating expenses	1,868,263	1,724,759	2,427,489
OPERATING INCOME	288,350	228,909	164,556
Other income, net	24,597	23,878	11,273
Interest expense, net of capitalized interest	78,559	67,597	47,082
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	234,388	185,190	128,747
Income tax provision	33,286	36,494	18,440
Equity in (loss) earnings of affiliates	(83,212)	14,311	13,628
NET INCOME	$ 117,890	$ 163,007	$ 123,935
EARNINGS PER COMMON SHARE
Basic (in dollars per share)	$ 1.23	$ 1.72	$ 1.39
Diluted (in dollars per share)	$ 1.22	$ 1.71	$ 1.38
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	96,227,000	94,798,000	89,242,000
Diluted (in shares)	96,560,000	95,103,000	89,596,000
Utility
Natural gas purchases:
Gas purchases	$ 247,734	$ 275,831	$ 320,256
Nonutility
Natural gas purchases:
Gas purchases	$ 1,096,920	$ 1,022,805	$ 1,716,098