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Details of Selected Consolidated Balance Sheet Captions - Deferred Credits and Other Liabilities Detail Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]        
Customer advances for construction $ 12,566 $ 11,010    
Other regulatory liabilities 16,120 78,599    
Asset retirement obligation 17,054 12,887    
Liabilities from risk management activities 1,249 103    
APT annual adjustment mechanism 25,545 15,310    
Unrecognized Tax Benefits 27,716 26,203 $ 23,719 $ 20,298
Other 20,883 13,916    
Total $ 121,133 $ 158,028