CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
OPERATING REVENUES
Utility	$ 1,301,496	$ 1,018,482	$ 1,011,284
Nonutility	734,916	778,057	951,710
Total operating revenues	2,036,412	1,796,539	1,962,994
Natural gas purchases:
Related parties	5,952	7,147	7,206
Operation and maintenance	410,506	394,636	373,568
Regulatory rider expenses	87,199	60,327	50,542
Depreciation and amortization	188,774	166,567	152,941
Gain on sale of assets	(58,200)	0	0
Total operating expenses	1,527,545	1,338,435	1,555,994
OPERATING INCOME	508,867	458,104	407,000
Other income, net	46,244	41,553	26,083
Interest expense, net of capitalized interest	128,595	130,275	123,014
INCOME BEFORE INCOME TAXES AND EQUITY IN EARNINGS OF AFFILIATES	426,516	369,382	310,069
Income tax provision	96,956	84,906	49,275
Equity in earnings of affiliates	6,067	5,299	3,930
NET INCOME	$ 335,627	$ 289,775	$ 264,724
EARNINGS PER COMMON SHARE
Basic (usd per share)	$ 3.35	$ 2.94	$ 2.73
Diluted (usd per share)	$ 3.33	$ 2.92	$ 2.71
WEIGHTED AVERAGE SHARES OUTSTANDING
Basic (in shares)	100,244	98,634	97,028
Diluted (in shares)	100,788	99,289	97,627
Utility
Natural gas purchases:
Natural gas purchases	$ 521,103	$ 405,332	$ 416,158
Nonutility
Natural gas purchases:
Natural gas purchases	$ 372,211	$ 304,426	$ 555,579