CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
OPERATING REVENUES
Utility	$ 1,127,417	$ 731,459	$ 729,923
Nonutility	1,778,562	1,425,154	1,223,745
Total operating revenues	2,905,979	2,156,613	1,953,668
Natural gas purchases:
Related parties	7,395	7,013	6,083
Operation and maintenance	361,866	366,905	278,143
Regulatory rider expenses	59,437	38,304	34,529
Depreciation and amortization	129,249	111,387	107,368
Total operating expenses	2,499,504	1,868,263	1,724,759
OPERATING INCOME	406,475	288,350	228,909
Other income, net	22,295	24,597	23,878
Interest expense, net of capitalized interest	85,830	78,559	67,597
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	342,940	234,388	185,190
Income tax provision	76,195	33,286	36,494
Equity in earnings (loss) of affiliates	8,177	(83,212)	14,311
NET INCOME	$ 274,922	$ 117,890	$ 163,007
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 2.86	$ 1.23	$ 1.72
Diluted (usd per share)	$ 2.85	$ 1.22	$ 1.71
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	96,100	96,227	94,798
Diluted (in shares)	96,488	96,560	95,103
Regulated
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 547,901	$ 247,734	$ 275,831
Unregulated
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 1,393,656	$ 1,096,920	$ 1,022,805