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Details of Selected Consolidated Balance Sheet Captions - Deferred Credits and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Balance Sheet Related Disclosures [Abstract]        
Pension and post retirement liabilities $ 185,617 $ 337,303    
Operating leases 194,745 201,071    
Customer advances for construction 9,879 10,060    
Other regulatory liabilities 75,506 17,838    
Asset retirement obligation 18,373 20,348    
APT annual adjustment mechanism 8,416 13,486    
Unrecognized tax benefits 32,792 30,921 $ 27,716 $ 26,203
Other 12,161 11,101    
Total $ 537,489 $ 642,128