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Contingencies and Guaranty - Narrative (Details) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Oct. 31, 2022 state | Mar. 31, 2026 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($)
Other Commitments [Line Items] |  |  |  |  |
Prepayments received |  |  | $ 161,178 | $ 124,672 | $ 122,212
Employer contribution amount |  |  | 400 | $ 500 |
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Wireless Licenses |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Consideration transferred | $ 28,000 |  |  |  |
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum | Wireless Licenses |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Prepayments received |  |  | 18,200 |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Agreement term |  | 20 years |  |  |
Number of states in service territory | state |  | 8 |  |  |
Prepayments received |  |  | 76,000 |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Prepayments received |  |  | $ 67,400 |  |

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