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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Income Tax Contingency [Line Items]      
Reduction of deferred tax liability $ 32,500    
Regulatory liabilities 1,405,246 $ 1,405,246 $ 1,386,126
Income tax benefit 21,000 21,000  
Deferred Income Tax Charge - Remeasurement Due to Law Change under the Reg Liability      
Income Tax Contingency [Line Items]      
Regulatory liabilities $ 12,100 $ 12,100