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Revenue and Accounts Receivable (Tables) | 12 Months Ended
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Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue | The following tables disaggregates our revenue from contracts with customers by customer type and segment and provides a reconciliation to total operating revenues, including intersegment revenues, for the periods presented.
| Year Ended September 30, 2025
| Distribution |  | Pipeline and Storage
| (In thousands)
Gas sales revenues: |  |  |
Residential | $ | 2,877,456 |  |  | $ | — |
Commercial | 1,145,710 |  |  | — |
Industrial | 122,284 |  |  | — |
Public authority and other | 51,354 |  |  | — |
Total gas sales revenues | 4,196,804 |  |  | — |
Transportation revenues | 151,876 |  |  | 1,119,015 |
Miscellaneous revenues | 13,123 |  |  | 12,749 |
Revenues from contracts with customers | 4,361,803 |  |  | 1,131,764 |
Alternative revenue program revenues | 49,215 |  |  | (66,464) |
Other revenues | 14,379 |  |  | — |
Total operating revenues | $ | 4,425,397 |  |  | $ | 1,065,300 |
| Year Ended September 30, 2024
| Distribution |  | Pipeline and Storage
Gas sales revenues: |  |  |
Residential | $ | 2,542,438 |  |  | $ | — |
Commercial | 1,006,593 |  |  | — |
Industrial | 100,363 |  |  | — |
Public authority and other | 51,337 |  |  | — |
Total gas sales revenues | 3,700,731 |  |  | — |
Transportation revenues | 134,600 |  |  | 982,795 |
Miscellaneous revenues | 11,836 |  |  | 15,892 |
Revenues from contracts with customers | 3,847,167 |  |  | 998,687 |
Alternative revenue program revenues | 52,401 |  |  | (60,658) |
Other revenues | 15,573 |  |  | — |
Total operating revenues | $ | 3,915,141 |  |  | $ | 938,029 |
| Year Ended September 30, 2023
| Distribution |  | Pipeline and Storage
Gas sales revenues: |  |  |
Residential | $ | 2,606,658 |  |  | $ | — |
Commercial | 1,100,773 |  |  | — |
Industrial | 151,538 |  |  | — |
Public authority and other | 61,345 |  |  | — |
Total gas sales revenues | 3,920,314 |  |  | — |
Transportation revenues | 121,420 |  |  | 811,968 |
Miscellaneous revenues | 10,044 |  |  | 12,180 |
Revenues from contracts with customers | 4,051,778 |  |  | 824,148 |
Alternative revenue program revenues | 43,139 |  |  | (38,974) |
Other revenues | 4,773 |  |  | — |
Total operating revenues | $ | 4,099,690 |  |  | $ | 785,174 |
Schedule of Allowance for Credit Loss Activity | Rollforwards of our allowance for uncollectible accounts for the years ended September 30, 2025, 2024, and 2023 are presented in the table below. We actively work with our customers experiencing financial hardship to offer flexible payment options and to direct them to aid agencies for financial assistance. Our allowance for uncollectible accounts reflects the expected impact on our customers’ ability to pay. Our allowance for uncollectible accounts also reflects the fact that we have the ability to recover the gas cost portion of uncollectible accounts through our gas cost recovery mechanisms in six states, which covers approximately 89 percent of our residential and commercial customers. 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.
| Allowance for uncollectible accounts
| (In thousands)
Balance, September 30, 2022 | $ | 49,993 |
Current period provisions | 22,353 |
Write-offs charged against allowance | (33,595) |
Recoveries of amounts previously written off | 2,089 |
Balance, September 30, 2023 | 40,840 |
Current period provisions | 24,843 |
Write-offs charged against allowance | (26,165) |
Recoveries of amounts previously written off | 1,730 |
Mississippi recovery of uncollectible accounts | (4,192) |
Balance, September 30, 2024 | 37,056 |
Current period provisions | 30,778 |
Write-offs charged against allowance | (24,631) |
Recoveries of amounts previously written off | 2,056 |
Balance, September 30, 2025 | $ | 45,259 |

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