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v3.25.1

Securitization - Schedule of Consolidated Statements of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Variable Interest Entity [Line Items] |  |  |  |
Operating revenues | $ 1,950,502 | $ 1,647,227 | $ 3,126,501 | $ 2,805,694
Operation and maintenance expense | (233,296) | (199,899) | (440,340) | (366,244)
Amortization expense | (182,750) | (165,087) | (363,283) | (329,695)
Interest expense, net | (50,014) | (55,442) | (102,939) | (107,317)
Income before income taxes | 603,097 | 512,235 | 1,034,286 | 877,351
Variable Interest Entity, Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Operating revenues | 2,951 | 3,469 | 6,344 | 6,802
Operation and maintenance expense | (216) | (224) | (277) | (224)
Amortization expense | (1,689) | (2,103) | (3,953) | (4,269)
Interest expense, net | (1,046) | (1,142) | (2,114) | (2,309)
Income before income taxes | $ 0 | $ 0 | $ 0 | $ 0

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