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Details of Selected Consolidated Balance Sheet Captions - Deferred Charges and Other Assets Detail Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Operating lease right-of-use assets $ 227,146  
Assets from risk management activities 74,991 $ 225
Total 801,170 391,213
Other Assets    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Marketable securities 103,952 101,883
Regulatory assets (See Note 2) 371,707 260,220
Operating lease right-of-use assets 227,146  
Assets from risk management activities 74,991 225
Taxes receivable 0 10,099
Other 23,374 18,786
Total $ 801,170 $ 391,213