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Details of Selected Consolidated Balance Sheet Captions - Deferred Credits and Other Liabilities Detail Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Balance Sheet Related Disclosures [Abstract]        
Pension and post retirement liabilities $ 337,303 $ 279,083    
Operating leases 201,071      
Customer advances for construction 10,060 12,566    
Other regulatory liabilities 17,838 16,120    
Asset retirement obligation 20,348 17,054    
Liabilities from risk management activities 0 1,249    
APT annual adjustment mechanism 13,486 25,545    
Unrecognized Tax Benefits 30,921 27,716 $ 26,203 $ 23,719
Other 11,101 20,883    
Total $ 642,128 $ 400,216