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Revenue and Accounts Receivable (Tables) | 6 Months Ended
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Mar. 31, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables disaggregate our revenue from contracts with customers by customer type and segment and provide a reconciliation to total operating revenues, including intersegment revenues, for the three and six months ended March 31, 2025 and 2024.
| Three Months Ended March 31, 2025 |  | Three Months Ended March 31, 2024
| Distribution |  | Pipeline and Storage |  | Distribution |  | Pipeline and Storage
| (In thousands)
Gas sales revenues: |  |  |  |  |  |  |
Residential | $ | 1,308,691 |  |  | $ | — |  |  | $ | 1,065,296 |  |  | $ | — |
Commercial | 480,108 |  |  | — |  |  | 404,701 |  |  | — |
Industrial | 38,885 |  |  | — |  |  | 30,419 |  |  | — |
Public authority and other | 23,921 |  |  | — |  |  | 21,120 |  |  | — |
Total gas sales revenues | 1,851,605 |  |  | — |  |  | 1,521,536 |  |  | — |
Transportation revenues | 43,352 |  |  | 266,514 |  |  | 37,607 |  |  | 223,159 |
Miscellaneous revenues | 4,222 |  |  | 4,259 |  |  | 3,724 |  |  | 2,162 |
Revenues from contracts with customers | 1,899,179 |  |  | 270,773 |  |  | 1,562,867 |  |  | 225,321 |
Alternative revenue program revenues | (20,117) |  |  | (11,774) |  |  | 22,315 |  |  | (1,834) |
Other revenues | 3,466 |  |  | — |  |  | 3,999 |  |  | — |
Total operating revenues | $ | 1,882,528 |  |  | $ | 258,999 |  |  | $ | 1,589,181 |  |  | $ | 223,487 |
| Six Months Ended March 31, 2025 |  | Six Months Ended March 31, 2024
| Distribution |  | Pipeline and Storage |  | Distribution |  | Pipeline and Storage
| (In thousands)
Gas sales revenues: |  |  |  |  |  |  |
Residential | $ | 2,001,741 |  |  | $ | — |  |  | $ | 1,792,978 |  |  | $ | — |
Commercial | 746,162 |  |  | — |  |  | 681,954 |  |  | — |
Industrial | 65,206 |  |  | — |  |  | 58,650 |  |  | — |
Public authority and other | 36,802 |  |  | — |  |  | 35,704 |  |  | — |
Total gas sales revenues | 2,849,911 |  |  | — |  |  | 2,569,286 |  |  | — |
Transportation revenues | 80,079 |  |  | 532,543 |  |  | 71,374 |  |  | 438,464 |
Miscellaneous revenues | 7,244 |  |  | 6,923 |  |  | 6,367 |  |  | 5,204 |
Revenues from contracts with customers | 2,937,234 |  |  | 539,466 |  |  | 2,647,027 |  |  | 443,668 |
Alternative revenue program revenues | 47,219 |  |  | (25,077) |  |  | 39,716 |  |  | (9,012) |
Other revenues | 7,410 |  |  | — |  |  | 7,776 |  |  | — |
Total operating revenues | $ | 2,991,863 |  |  | $ | 514,389 |  |  | $ | 2,694,519 |  |  | $ | 434,656 |
Schedule of Allowance for Credit Loss Activity | Rollforwards of our allowance for uncollectible accounts for the three and six months ended March 31, 2025 and 2024 are presented in the table below. The allowance excludes the gas cost portion of customers’ bills for approximately 89 percent of our customers as we have the ability to collect these gas costs through our gas cost recovery mechanisms in most of our jurisdictions. In December 2023, the Mississippi Public Service Commission approved the recovery of uncollectible accounts through our purchased gas cost mechanism over a two-year period rather than through our annual filing mechanism over a one-year period. As a result of this decision, we recorded a $13.9 million reduction to bad debt expense during the first quarter of fiscal 2024. Of this amount, $9.7 million represents future recovery of customer receivables previously written off since April 2022 but not yet recovered through our rates. This amount increased our deferred gas cost regulatory asset. The remaining $4.2 million reduction represents a reversal of our allowance for uncollectible accounts for customer balances that have not yet been written off.
| Three Months Ended March 31, 2025
| (In thousands)
Beginning balance, December 31, 2024 | $ | 39,166 |
Current period provisions | 14,391 |
Write-offs charged against allowance | (4,761) |
Recoveries of amounts previously written off | 545 |
Ending balance, March 31, 2025 | $ | 49,341 |
| Three Months Ended March 31, 2024
| (In thousands)
Beginning balance, December 31, 2023 | $ | 35,406 |
Current period provisions | 12,797 |
Write-offs charged against allowance | (5,859) |
Recoveries of amounts previously written off | 361 |
Ending balance, March 31, 2024 | $ | 42,705 |
| Six Months Ended March 31, 2025
| (In thousands)
Beginning balance, September 30, 2024 | $ | 37,056 |
Current period provisions | 23,015 |
Write-offs charged against allowance | (12,209) |
Recoveries of amounts previously written off | 1,479 |
Ending balance, March 31, 2025 | $ | 49,341 |
| Six Months Ended March 31, 2024
| (In thousands)
Beginning balance, September 30, 2023 | $ | 40,840 |
Current period provisions | 19,547 |
Write-offs charged against allowance | (14,616) |
Recoveries of amounts previously written off | 1,126 |
Mississippi recovery of uncollectible accounts | (4,192) |
Ending balance, March 31, 2024 | $ | 42,705 |

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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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