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Unaudited Financial Information (Tables) | 9 Months Ended
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Jun. 30, 2022
Accounting Policies [Abstract] |
Schedule of Regulatory Assets | Significant regulatory assets and liabilities as of June 30, 2022 and September 30, 2021 included the following:
| June 30, 2022 |  | September 30, 2021
| (In thousands)
Regulatory assets: |  |  |
Pension and postretirement benefit costs | $ | 34,482 |  |  | $ | 45,922 |
Infrastructure mechanisms (1) | 225,279 |  |  | 222,795 |
Winter Storm Uri incremental costs (2) | 2,107,820 |  |  | 2,100,728 |
Deferred gas costs | 42,818 |  |  | 66,395 |
Regulatory excess deferred taxes | 48,746 |  |  | 45,370 |
Recoverable loss on reacquired debt | 3,448 |  |  | 3,789 |
Deferred pipeline record collection costs | 35,212 |  |  | 32,099 |
Other | 15,552 |  |  | 4,343 |
| $ | 2,513,357 |  |  | $ | 2,521,441 |
Regulatory liabilities: |  |  |
Regulatory excess deferred taxes | $ | 586,149 |  |  | $ | 705,084 |
Regulatory cost of removal obligation | 558,542 |  |  | 541,511 |
Deferred gas costs | 45,874 |  |  | 52,553 |
Asset retirement obligation | 18,373 |  |  | 18,373 |
APT annual adjustment mechanism | 26,689 |  |  | 31,110 |
Pension and postretirement benefit costs | 51,954 |  |  | 56,201 |
Other | 23,223 |  |  | 19,363 |
| $ | 1,310,804 |  |  | $ | 1,424,195 |
(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 subject to securitization incurred during Winter Storm Uri and permissible carrying costs. See Note 8 to the unaudited condensed consolidated financial statements for further information. This amount is recorded within other current assets and deferred charges and other assets on the condensed consolidated balance sheet as of June 30, 2022.
Schedule of Regulatory Liabilities | Significant regulatory assets and liabilities as of June 30, 2022 and September 30, 2021 included the following:
| June 30, 2022 |  | September 30, 2021
| (In thousands)
Regulatory assets: |  |  |
Pension and postretirement benefit costs | $ | 34,482 |  |  | $ | 45,922 |
Infrastructure mechanisms (1) | 225,279 |  |  | 222,795 |
Winter Storm Uri incremental costs (2) | 2,107,820 |  |  | 2,100,728 |
Deferred gas costs | 42,818 |  |  | 66,395 |
Regulatory excess deferred taxes | 48,746 |  |  | 45,370 |
Recoverable loss on reacquired debt | 3,448 |  |  | 3,789 |
Deferred pipeline record collection costs | 35,212 |  |  | 32,099 |
Other | 15,552 |  |  | 4,343 |
| $ | 2,513,357 |  |  | $ | 2,521,441 |
Regulatory liabilities: |  |  |
Regulatory excess deferred taxes | $ | 586,149 |  |  | $ | 705,084 |
Regulatory cost of removal obligation | 558,542 |  |  | 541,511 |
Deferred gas costs | 45,874 |  |  | 52,553 |
Asset retirement obligation | 18,373 |  |  | 18,373 |
APT annual adjustment mechanism | 26,689 |  |  | 31,110 |
Pension and postretirement benefit costs | 51,954 |  |  | 56,201 |
Other | 23,223 |  |  | 19,363 |
| $ | 1,310,804 |  |  | $ | 1,424,195 |
(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 subject to securitization incurred during Winter Storm Uri and permissible carrying costs. See Note 8 to the unaudited condensed consolidated financial statements for further information. This amount is recorded within other current assets and deferred charges and other assets on the condensed consolidated balance sheet as of June 30, 2022.

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- Definition Tabular disclosure of assets that are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 715 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501251&loc=d3e52485-110419 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44264-110382 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 405 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394 + Details
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