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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]  
Schedule of Capitalization
The following table details amounts capitalized for the fiscal year ended September 30.
202520242023
Component of AFUDCStatement of Comprehensive Income Location(In thousands)
DebtInterest charges$21,104 $14,655 $15,808 
EquityOther non-operating income75,425 58,234 64,019 
$96,529 $72,889 $79,827