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Unaudited Financial Information | 3 Months Ended
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Dec. 31, 2022
Accounting Policies [Abstract] |
Unaudited Financial Information | Unaudited Financial Information These consolidated interim-period financial statements have been prepared in accordance with accounting principles generally accepted in the United States on the same basis as those used for the Company’s audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2022. In the opinion of management, all material adjustments (consisting of normal recurring accruals) necessary for a fair presentation have been made to the unaudited consolidated interim-period financial statements. These consolidated interim-period financial statements are condensed as permitted by the instructions to Form 10-Q and should be read in conjunction with the audited consolidated financial statements of Atmos Energy Corporation included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2022. Because of seasonal and other factors, the results of operations for the three-month period ended December 31, 2022 are not indicative of our results of operations for the full 2023 fiscal year, which ends September 30, 2023. No events have occurred subsequent to the balance sheet date that would require recognition or disclosure in the unaudited condensed consolidated financial statements. Significant accounting policies Our accounting policies are described in Note 2 to the consolidated financial statements in our Annual Report on Form 10-K for the fiscal year ended September 30, 2022. Regulatory assets and liabilities Accounting principles generally accepted in the United States require cost-based, rate-regulated entities that meet certain criteria to reflect the authorized recovery of costs due to regulatory decisions in their financial statements. As a result, certain costs are permitted to be capitalized rather than expensed because they can be recovered through rates. We record certain costs as regulatory assets when future recovery through customer rates is considered probable. Regulatory liabilities are recorded when it is probable that revenues will be reduced for amounts that will be credited to customers 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. Significant regulatory assets and liabilities as of December 31, 2022 and September 30, 2022 included the following:
| December 31, 2022 |  | September 30, 2022
| (In thousands)
Regulatory assets: |  |  |
Pension and postretirement benefit costs | $ | 26,977 |  |  | $ | 31,122 |
Infrastructure mechanisms (1) | 164,818 |  |  | 235,972 |
Winter Storm Uri incremental costs (2) | 2,125,787 |  |  | 2,109,454 |
Deferred gas costs | 41,096 |  |  | 119,742 |
Regulatory excess deferred taxes (3) | 48,033 |  |  | 47,311 |
Recoverable loss on reacquired debt | 3,364 |  |  | 3,406 |
Deferred pipeline record collection costs | 38,647 |  |  | 36,898 |
Other | 23,088 |  |  | 21,467 |
| $ | 2,471,810 |  |  | $ | 2,605,372 |
Regulatory liabilities: |  |  |
Regulatory excess deferred taxes (3) | $ | 506,406 |  |  | $ | 545,021 |
Regulatory cost of removal obligation | 572,384 |  |  | 568,307 |
Deferred gas costs | 39,013 |  |  | 28,834 |
Asset retirement obligation | 5,737 |  |  | 5,737 |
APT annual adjustment mechanism | 37,443 |  |  | 31,138 |
Pension and postretirement benefit costs | 151,843 |  |  | 156,857 |
Other | 27,141 |  |  | 23,013 |
| $ | 1,339,967 |  |  | $ | 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 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 December 31, 2022 and September 30, 2022. (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 11 to the unaudited condensed consolidated financial statements for further information.

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- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126899994&loc=d3e18726-107790 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI https://asc.fasb.org/topic&trid=2122369 + Details
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