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Description of Business (Details) - USD ($) $ in Millions |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 14, 2025 | Sep. 05, 2025 | Aug. 11, 2025 | Jul. 08, 2025 | Apr. 22, 2024 | Apr. 13, 2024 | Dec. 28, 2025 | Jun. 18, 2025 | Jul. 08, 2025 | Dec. 29, 2024
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, net proceed received | $ 250.9 |  |  |  |  |  |  |  |  |
Common stock outstanding (in shares) |  |  |  |  |  |  | 100,724,862 |  |  | 88,517,521
Percentage of ownership after transaction | 14.20% |  |  |  |  |  |  |  |  |
IPO |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock, net proceed received |  |  |  |  | $ 327.7 |  |  |  |  |
Private Placement |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) | 3,488,372 |  |  |  |  |  |  |  |  |
Public Offering |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) | 7,441,860 |  |  |  |  |  |  |  |  |
Underwriters Option Exercised |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) |  |  |  |  |  |  | 1,116,279 |  |  |
Southwest Gas Holdings |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) |  | 27,362,210 | 17,250,000 |  |  |  |  | 21,562,500 |  |
Common stock outstanding (in shares) |  |  | 27,362,210 | 46,185,710 | 71,665,592 |  |  |  | 46,185,710 |
Percentage of ownership after sale of stock |  |  | 31.00% | 52.00% | 81.00% |  |  |  |  |
Southwest Gas Holdings | Private Placement |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) |  |  | 1,573,500 |  |  |  |  |  | 3,917,382 |
Southwest Gas Holdings | Previously Reported |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) |  |  |  |  |  | 71,664,592 |  |  |  |

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