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Utility Regulatory Assets and Liabilities and Regulatory Matters - Narrative (Details) - USD ($) $ in Thousands |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 24, 2022 | Jan. 28, 2022 | Nov. 09, 2021 | Apr. 01, 2021 | Feb. 08, 2021 | Oct. 08, 2020 | Jan. 28, 2020 | Dec. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  |  |  | $ 372,000 | $ 509,000
Gas Utility |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) |  |  |  |  |  |  |  | $ 35,000 | $ 7,000 | $ 9,000
Gas Utility | PAPUC |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested rate increase |  | $ 83,000 |  |  |  |  | $ 75,000 |  |  |
Property, plant and equipment, net threshold |  |  |  | $ 2,875,000 |  |  |  |  |  |
Amortization period |  |  |  | 10 years |  |  |  |  |  |
Gas Utility | PAPUC | Joint Petition |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested rate increase | $ 49,000 |  |  |  |  |  |  |  |  |
Rate period |  | 5 years |  |  |  |  |  |  |  |
Weather condition rate |  | 3.00% |  |  |  |  |  |  |  |
Property, plant and equipment, net threshold |  | $ 3,368 |  |  |  |  |  |  |  |
Gas Utility | PAPUC | Phase I |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested rate increase | 38,000 |  |  |  |  |  |  |  |  |
Gas Utility | PAPUC | Phase II |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested rate increase | $ 11,000 |  |  |  |  |  |  |  |  |
Gas Utility | PAPUC | Annual Base Distribution |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  | $ 20,000 |  |  |  |
Gas Utility | PAPUC | Beginning January 1, 2021 |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  | 10,000 |  |  |  |
Gas Utility | PAPUC | Beginning July 1, 2021 |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Approved rate increase |  |  |  |  |  | $ 10,000 |  |  |  |
Electric Utility | PAPUC |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested rate increase |  |  |  |  | $ 9,000 |  |  |  |  |
Electric Utility | PAPUC | Joint Petition |  |  |  |  |  |  |  |  |  |
Regulatory Assets |  |  |  |  |  |  |  |  |  |
Requested rate increase |  |  | $ 6,000 |  |  |  |  |  |  |

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