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Unaudited Financial Information (Tables)
 9 Months Ended
Jun. 30, 2023
Accounting Policies [Abstract]  
Schedule of Regulatory Assets
Significant regulatory assets and liabilities as of June 30, 2023 and September 30, 2022 included the following:
June 30,
2023		September 30,
2022
 (In thousands)
Regulatory assets:
Pension and postretirement benefit costs$22,941 $31,122 
Infrastructure mechanisms (1)
218,999 235,972 
Winter Storm Uri incremental costs (2)
32,441 2,109,454 
Deferred gas costs48,649 119,742 
Regulatory excess deferred taxes (3)
47,252 47,311 
Recoverable loss on reacquired debt3,280 3,406 
Deferred pipeline record collection costs52,588 36,898 
Other16,430 21,467 
$442,580 $2,605,372 
Regulatory liabilities:
Regulatory excess deferred taxes (3)
$425,440 $545,021 
Regulatory cost of removal obligation574,098 568,307 
Deferred gas costs34,933 28,834 
Asset retirement obligation5,737 5,737 
APT annual adjustment mechanism42,797 31,138 
Pension and postretirement benefit costs141,032 156,857 
Other27,055 23,013 
$1,251,092 $1,358,907 
 
(1)Infrastructure mechanisms in Texas, Louisiana and Tennessee allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.
(2)Includes extraordinary gas costs incurred during Winter Storm Uri and certain related carrying costs. See Note 8 to the condensed consolidated financial statements for further information.
(3)Regulatory excess deferred taxes represent changes in our net deferred tax liability related to our cost of service ratemaking due to the enactment of Tax Cuts and Jobs Act of 2017 (the "TCJA") and a Kansas legislative change enacted in fiscal 2020. See Note 12 to the condensed consolidated financial statements for further information.
Schedule of Regulatory Liabilities
Significant regulatory assets and liabilities as of June 30, 2023 and September 30, 2022 included the following:
June 30,
2023		September 30,
2022
 (In thousands)
Regulatory assets:
Pension and postretirement benefit costs$22,941 $31,122 
Infrastructure mechanisms (1)
218,999 235,972 
Winter Storm Uri incremental costs (2)
32,441 2,109,454 
Deferred gas costs48,649 119,742 
Regulatory excess deferred taxes (3)
47,252 47,311 
Recoverable loss on reacquired debt3,280 3,406 
Deferred pipeline record collection costs52,588 36,898 
Other16,430 21,467 
$442,580 $2,605,372 
Regulatory liabilities:
Regulatory excess deferred taxes (3)
$425,440 $545,021 
Regulatory cost of removal obligation574,098 568,307 
Deferred gas costs34,933 28,834 
Asset retirement obligation5,737 5,737 
APT annual adjustment mechanism42,797 31,138 
Pension and postretirement benefit costs141,032 156,857 
Other27,055 23,013 
$1,251,092 $1,358,907 
 
(1)Infrastructure mechanisms in Texas, Louisiana and Tennessee allow for the deferral of all eligible expenses associated with capital expenditures incurred pursuant to these rules, including the recording of interest on deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recoverable through base rates.
(2)Includes extraordinary gas costs incurred during Winter Storm Uri and certain related carrying costs. See Note 8 to the condensed consolidated financial statements for further information.
(3)Regulatory excess deferred taxes represent changes in our net deferred tax liability related to our cost of service ratemaking due to the enactment of Tax Cuts and Jobs Act of 2017 (the "TCJA") and a Kansas legislative change enacted in fiscal 2020. See Note 12 to the condensed consolidated financial statements for further information.