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Details of Selected Consolidated Balance Sheet Captions - Other Current Liabilities Detail Table (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Offsetting [Abstract]    
Customer credit balances and deposits $ 54,617 $ 52,648
Accrued employee costs 55,216 52,101
Deferred gas costs 14,112 94,705
Accrued interest 51,381 39,486
Liabilities from risk management activities 4,552 56,734
Taxes payable 135,597 123,457
Pension and postretirement obligations 26,197 10,475
Regulatory cost of service reserve 4,209 22,508
Regulatory cost of removal obligation 55,721 55,770
APT annual adjustment mechanism, current 52,856 19,918
Regulatory excess deferred taxes (See Note 13) 21,206 5,225
Other 3,837 14,041
Total $ 479,501 $ 547,068