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v3.25.4

Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) | 12 Months Ended
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Dec. 28, 2025 USD ($) agreement | Dec. 29, 2024 USD ($) | Dec. 31, 2023 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Number of agreements | agreement | 2 |  |
CCA assets | $ 31,200,000 | $ 29,600,000 |
Accumulated depreciation | 6,400,000 | 2,700,000 |
Implementation costs | 24,800,000 | 26,900,000 |
CCA assets amortization expense | $ 3,700,000 | $ 2,600,000 |
Amortization period | 18 years | 18 years |
Impairment related to long-lived assets | $ 0 | $ 0 | $ 0
Goodwill impairment | 0 | 0 | 213,992,000
Amount deductible under liability insurance policies | 750,000 |  |
Net operating losses | 84,499,000 | 17,937,000 |
Deferred tax assets, net | 174,100,000 | 113,946,000 |
Foreign income taxes | $ 0 |  |
Collective bargaining agreements, employee percentage | 0.57 |  |
Number of collective bargaining agreements | agreement | 332 |  |
Number of collective bargaining agreements expired, year one | agreement | 27 |  |
Number of collective bargaining agreements expired, year two | agreement | 14 |  |
Allocation of tax assets from Southwest Gas Holdings | $ (20,861,000) |  |
Other Nonoperating Income (Expense) |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Gain (loss) on foreign currency transaction | (100,000) | (100,000) | $ (500,000)
CANADA |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Repatriated foreign earnings | 0 | $ 0 |
Southwest Gas Holdings |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Net operating losses | 55,400,000 |  |
Deferred tax assets, net | $ 23,700,000 |  |
Minimum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization period | 1 year |  |
Maximum |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization period | 21 years |  |

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