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Pending Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Dec. 17, 2025	Nov. 06, 2025	Dec. 31, 2026	Mar. 31, 2026	Mar. 31, 2025	Sep. 30, 2025
Business Combination [Line Items]
Common stock, par value (in dollars per share)				$ 1		$ 1
Net Proceeds from Common Stock Sale				$ 338,403	$ 0
Sale of Common Stock
Business Combination [Line Items]
Common stock issued from sale of common stock (in shares)	4,402,513			4,402,513
Common stock, par value (in dollars per share)	$ 1.00
Per share or per unit amount of equity securities issued (in dollars per share)	$ 79.50
Net Proceeds from Common Stock Sale	$ 338,400
Vectren Energy Delivery of Ohio, LLC \| Senior Unsecured Bridge Loan Facility & Term Loan Facility Commitment Letter, Net
Business Combination [Line Items]
Total commitments under loan facilities				$ 2,280,000
Vectren Energy Delivery of Ohio, LLC \| Term Loan Facility, Commitment Letter
Business Combination [Line Items]
Debt instrument, term		364 days
Forecast \| Vectren Energy Delivery of Ohio, LLC
Business Combination [Line Items]
Total consideration			$ 2,620,000
Payments to acquire businesses, gross			1,420,000
Forecast \| Vectren Energy Delivery of Ohio, LLC \| Promissory Note
Business Combination [Line Items]
Promissory note, face amount			$ 1,200,000
Debt instrument, term			364 days
Interest rate (in percent)			6.50%