CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
OPERATING REVENUES
Utility	$ 400,500	$ 463,474	$ 757,909	$ 737,909
Nonutility	243,527	448,842	609,685	850,249
Total operating revenues	644,027	912,316	1,367,594	1,588,158
Natural gas purchases:
Related parties	1,770	1,883	3,597	3,729
Operation and maintenance	99,095	85,786	178,596	154,770
Regulatory rider expenses	23,154	30,910	41,405	47,581
Depreciation and amortization	38,090	31,435	74,773	61,828
Total operating expenses	478,843	773,441	1,029,621	1,292,398
OPERATING INCOME	165,184	138,875	337,973	295,760
Other income, net	4,779	4,127	9,434	8,263
Interest expense, net of capitalized interest	30,261	18,926	59,752	38,403
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	139,702	124,076	287,655	265,620
Income tax provision	30,586	28,810	63,564	59,617
Equity in earnings of affiliates	1,131	769	2,077	1,344
NET INCOME	$ 110,247	$ 96,035	$ 226,168	$ 207,347
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 1.14	$ 1.00	$ 2.34	$ 2.16
Diluted (usd per share)	$ 1.13	$ 1.00	$ 2.32	$ 2.15
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	96,893	96,068	96,689	96,006
Diluted (in shares)	97,556	96,516	97,346	96,480
Utility
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 156,370	$ 212,892	$ 338,816	$ 335,161
Nonutility
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 160,364	$ 410,535	$ 392,434	$ 689,329