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Regulation | 12 Months Ended
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Sep. 30, 2025
Regulated Operations [Abstract] |
Regulation | Regulation Our distribution and pipeline and storage operations are subject to regulation with respect to rates, service, maintenance of accounting records, and various other matters by the respective regulatory authorities in the states in which we operate, which creates regulatory assets and liabilities that are recovered from or refunded to customers over time through the ratemaking process. Substantially all of our regulatory assets are recorded as a component of other current assets and deferred charges and other assets and our regulatory liabilities are recorded as a component of other current liabilities and deferred credits and other liabilities. Deferred gas costs are recorded either in other current assets or liabilities and the long-term portion of regulatory excess deferred taxes and regulatory cost of removal obligation are reported separately. Significant regulatory assets and liabilities as of September 30, 2025 and 2024 included the following:
| September 30
| 2025 |  | 2024
| (In thousands)
Regulatory assets: |  |  |
Pension and postretirement benefit costs | $ | 262 |  |  | $ | 11,243 |
Infrastructure mechanisms (1) | 314,047 |  |  | 246,734 |
Winter Storm Uri incremental costs | 5,841 |  |  | 10,373 |
Deferred gas costs | 140,626 |  |  | 159,762 |
Regulatory excess deferred taxes (2) | 49,793 |  |  | 51,380 |
Recoverable loss on reacquired debt | 2,903 |  |  | 3,070 |
Deferred pipeline record collection costs | 39,035 |  |  | 41,742 |
System Safety and Integrity Riders (3) | 43,625 |  |  | 38,632 |
Other | 12,597 |  |  | 16,454 |
| $ | 608,729 |  |  | $ | 579,390 |
Regulatory liabilities: |  |  |
Regulatory excess deferred taxes (2) | $ | 190,274 |  |  | $ | 257,001 |
Regulatory cost of removal obligation | 641,019 |  |  | 607,032 |
Deferred gas costs | 6,879 |  |  | 9,142 |
APT annual adjustment mechanism | 99,393 |  |  | 73,119 |
Pension and postretirement benefit costs | 291,351 |  |  | 247,250 |
Other | 40,732 |  |  | 34,338 |
| $ | 1,269,648 |  |  | $ | 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 the deferred expenses until the next rate proceeding (rate case or annual rate filing), at which time investment and costs would be recovered 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 the 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 Notes 13 and 15 to the consolidated financial statements for further information. (3)In our APT and West Texas Divisions and portions of our Mid-Tex Division, the RRC has approved the deferral of certain system safety and integrity costs incurred in excess of a specified benchmark. These costs are eligible for recovery in a future filing after such costs are approved by the RRC.

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- Definition The entire disclosure for public utilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/980/tableOfContent + Details
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