CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2025	Sep. 30, 2025
ASSETS
Property, plant and equipment	$ 30,322,427	$ 29,264,136
Less accumulated depreciation and amortization	4,054,556	3,971,146
Net property, plant and equipment	26,267,871	25,292,990
Current assets
Cash and cash equivalents	367,023	202,687
Restricted cash and cash equivalents	4,488	1,116
Cash and cash equivalents and restricted cash and cash equivalents	371,511	203,803
Accounts receivable, net	731,131	375,509
Gas stored underground	159,529	171,756
Other current assets	373,652	301,627
Total current assets	1,635,823	1,052,695
Securitized intangible asset, net (See Note 9)	72,798	75,127
Goodwill	731,257	731,257
Deferred charges and other assets	1,090,646	1,097,453
Total assets	29,798,395	28,249,522
Shareholders’ equity
Common stock, no par value (stated at $0.005 per share); 200,000,000 shares authorized; issued and outstanding: December 31, 2025 — 165,434,477 shares; September 30, 2025 — 161,568,384 shares	827	808
Additional paid-in capital	8,707,686	8,221,455
Accumulated other comprehensive income	470,210	475,015
Retained earnings	5,104,169	4,861,612
Shareholders’ equity	14,282,892	13,558,890
Long-term debt, net	9,553,625	8,907,169
Securitized long-term debt (See Note 9)	68,236	68,236
Total capitalization	23,904,753	22,534,295
Current liabilities
Accounts payable and accrued liabilities	616,867	506,516
Other current liabilities	819,147	835,557
Current maturities of long-term debt	2,250	11,775
Current maturities of securitized long-term debt (See Note 9)	8,767	8,767
Total current liabilities	1,447,031	1,362,615
Deferred income taxes	3,028,313	2,918,347
Regulatory excess deferred taxes	106,099	117,482
Regulatory cost of removal obligation	520,047	532,461
Deferred credits and other liabilities	792,152	784,322
Total capitalization and liabilities	$ 29,798,395	$ 28,249,522