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Regulation (Tables) | 6 Months Ended
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Mar. 31, 2025
Regulated Operations [Abstract] |
Schedule of Regulatory Assets | Regulatory assets and liabilities as of March 31, 2025 and September 30, 2024 included the following:
| March 31, 2025 |  | September 30, 2024
| (In thousands)
Regulatory assets: |  |  |
Pension and postretirement benefit costs | $ | 4,326 |  |  | $ | 11,243 |
Infrastructure mechanisms (1) | 239,997 |  |  | 246,734 |
Winter Storm Uri incremental costs | 6,812 |  |  | 10,373 |
Deferred gas costs | 3,830 |  |  | 159,762 |
Regulatory excess deferred taxes (2) | 50,526 |  |  | 51,380 |
Recoverable loss on reacquired debt | 2,987 |  |  | 3,070 |
Deferred pipeline record collection costs | 39,899 |  |  | 41,742 |
APT annual System Safety and Integrity Rider (3) | 34,142 |  |  | 38,632 |
Other | 16,270 |  |  | 16,454 |
| $ | 398,789 |  |  | $ | 579,390 |
Regulatory liabilities: |  |  |
Regulatory excess deferred taxes (2) | $ | 229,096 |  |  | $ | 257,001 |
Regulatory cost of removal obligation | 625,899 |  |  | 607,032 |
Deferred gas costs | 54,794 |  |  | 9,142 |
APT annual adjustment mechanism | 78,126 |  |  | 73,119 |
Pension and postretirement benefit costs | 236,382 |  |  | 247,250 |
Other | 51,006 |  |  | 34,338 |
| $ | 1,275,303 |  |  | $ | 1,227,882 |
(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)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"), a Kansas legislative change enacted in fiscal 2020, and a Louisiana legislative change enacted in fiscal 2025. See Note 12 to the condensed consolidated financial statements for further information. (3)In APT's general rate case settlement in December 2023, the RRC approved a new annual compliance filing that allows APT to recover certain system safety and integrity costs incurred each year. Costs above a specified benchmark are deferred onto the balance sheet as incurred. Once the filing is approved by the RRC, the revenue and expense are recognized over 12 months resulting in no impact to operating income.
Schedule of Regulatory Liabilities | Regulatory assets and liabilities as of March 31, 2025 and September 30, 2024 included the following:
| March 31, 2025 |  | September 30, 2024
| (In thousands)
Regulatory assets: |  |  |
Pension and postretirement benefit costs | $ | 4,326 |  |  | $ | 11,243 |
Infrastructure mechanisms (1) | 239,997 |  |  | 246,734 |
Winter Storm Uri incremental costs | 6,812 |  |  | 10,373 |
Deferred gas costs | 3,830 |  |  | 159,762 |
Regulatory excess deferred taxes (2) | 50,526 |  |  | 51,380 |
Recoverable loss on reacquired debt | 2,987 |  |  | 3,070 |
Deferred pipeline record collection costs | 39,899 |  |  | 41,742 |
APT annual System Safety and Integrity Rider (3) | 34,142 |  |  | 38,632 |
Other | 16,270 |  |  | 16,454 |
| $ | 398,789 |  |  | $ | 579,390 |
Regulatory liabilities: |  |  |
Regulatory excess deferred taxes (2) | $ | 229,096 |  |  | $ | 257,001 |
Regulatory cost of removal obligation | 625,899 |  |  | 607,032 |
Deferred gas costs | 54,794 |  |  | 9,142 |
APT annual adjustment mechanism | 78,126 |  |  | 73,119 |
Pension and postretirement benefit costs | 236,382 |  |  | 247,250 |
Other | 51,006 |  |  | 34,338 |
| $ | 1,275,303 |  |  | $ | 1,227,882 |
(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)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"), a Kansas legislative change enacted in fiscal 2020, and a Louisiana legislative change enacted in fiscal 2025. See Note 12 to the condensed consolidated financial statements for further information. (3)In APT's general rate case settlement in December 2023, the RRC approved a new annual compliance filing that allows APT to recover certain system safety and integrity costs incurred each year. Costs above a specified benchmark are deferred onto the balance sheet as incurred. Once the filing is approved by the RRC, the revenue and expense are recognized over 12 months resulting in no impact to operating income.

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- Definition Tabular disclosure of regulatory liabilities. Detailed information about liabilities that result from rate actions of a regulator. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 405 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477571/980-405-25-1 + Details
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