CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
OPERATING REVENUES
Utility	$ 293,093	$ 357,409
Nonutility	174,117	366,158
Total operating revenues	467,210	723,567
Natural gas purchases:
Related parties	1,879	1,827
Operation and maintenance	94,439	79,501
Regulatory rider expenses	19,189	18,251
Depreciation and amortization	40,287	36,683
Total operating expenses	331,391	550,778
OPERATING INCOME	135,819	172,789
Other income, net	6,341	4,655
Interest expense, net of capitalized interest	31,473	29,491
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	110,687	147,953
Income tax provision	22,936	32,978
Equity in earnings of affiliates	1,660	946
NET INCOME	$ 89,411	$ 115,921
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 0.91	$ 1.20
Diluted (usd per share)	$ 0.91	$ 1.19
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	97,869	96,485
Diluted (in shares)	98,563	97,083
Utility
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 116,120	$ 182,446
Nonutility
Natural gas purchases:
Gas purchases - Utility and Nonutility	$ 59,477	$ 232,070