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PROPERTY, PLANT, AND EQUIPMENT - SAMSON AND DELILAH - STORM DAMAGE (Details) - Electric - generation - USD ($) $ in Millions | 3 Months Ended
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Jun. 30, 2026 | Sep. 30, 2025 | Jun. 30, 2025
Samson I Solar Energy Center |  |  |
Property, plant, and equipment |  |  |
Impairment due to storm damage |  |  | $ 2.8
Insurance receivable |  |  | 2.8
Samson I Solar Energy Center and Delilah Solar Energy |  |  |
Property, plant, and equipment |  |  |
Impairment due to storm damage |  | $ 12.0 | $ 8.8
Delilah Solar Energy LLC |  |  |
Property, plant, and equipment |  |  |
Impairment due to storm damage | $ 1.7 |  |

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