CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
OPERATING REVENUES
Utility	$ 462,863	$ 400,500	$ 755,956	$ 757,909
Nonutility	195,050	243,527	369,167	609,685
Total operating revenues	657,913	644,027	1,125,123	1,367,594
Natural gas purchases:
Related parties	1,799	1,770	3,678	3,597
Operation and maintenance	107,223	99,095	201,662	178,596
Regulatory rider expenses	29,229	23,154	48,418	41,405
Depreciation and amortization	40,075	38,090	80,362	74,773
Total operating expenses	487,691	478,843	819,082	1,029,621
OPERATING INCOME	170,222	165,184	306,041	337,973
Other income, net	15,420	4,779	21,761	9,434
Interest expense, net of capitalized interest	31,621	30,261	63,094	59,752
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	154,021	139,702	264,708	287,655
Income tax provision	33,947	30,586	56,883	63,564
Equity in earnings of affiliates	738	1,131	2,398	2,077
NET INCOME	$ 120,812	$ 110,247	$ 210,223	$ 226,168
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 1.23	$ 1.14	$ 2.14	$ 2.34
Diluted (usd per share)	$ 1.22	$ 1.13	$ 2.13	$ 2.32
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	98,377	96,893	98,123	96,689
Diluted (in shares)	99,102	97,556	98,839	97,346
Utility
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 204,347	$ 156,370	$ 320,467	$ 338,816
Nonutility
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 105,018	$ 160,364	$ 164,495	$ 392,434