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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 28, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | Changes in the carrying amount of goodwill of each of the Company’s reportable segments were as follows (in thousands):
| U.S. Gas |  | Canadian Operations(1) |  | Union Electric (2) |  | Non-Union Electric |  | Total
Balances as of December 31, 2023 | $ | 58,160 |  |  | $ | 93,911 |  |  | $ | 56,499 |  |  | $ | 167,322 |  |  | $ | 375,892 |
Effect of exchange rate changes | — |  |  | (7,590) |  |  | — |  |  | — |  |  | (7,590) |
Balances as of December 29, 2024 | $ | 58,160 |  |  | $ | 86,321 |  |  | $ | 56,499 |  |  | $ | 167,322 |  |  | $ | 368,302 |
Effect of exchange rate changes | — |  |  | 4,842 |  |  | — |  |  | — |  |  | 4,842 |
Addition from Connect acquisition | — |  |  | 22,527 |  |  | — |  |  | — |  |  | 22,527 |
Balances as of December 28, 2025 | $ | 58,160 |  |  | $ | 113,690 |  |  | $ | 56,499 |  |  | $ | 167,322 |  |  | $ | 395,671 |
(1)Net of accumulated impairment of $10.8 million as of December 28, 2025, December 29, 2024 and December 31, 2023. (2)Net of accumulated impairment of $391.1 million as of December 28, 2025, December 29, 2024 and December 31, 2023.
Schedule of Finite-Lived Intangible Assets | The Company’s definite-lived intangible assets and respective carrying values were as follows (in thousands, except for weighted average amortization periods, which are in years):
| December 28, 2025
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | 19 |  | $ | 414,808 |  |  | $ | (127,463) |  |  | $ | 287,345 |
Trade names and trademarks | 15 |  | 82,057 |  |  | (28,227) |  |  | 53,830 |
Backlog | 0.8 |  | 2,481 |  |  | (413) |  |  | 2,068 |
Total intangible assets | 18 |  | $ | 499,346 |  |  | $ | (156,103) |  |  | $ | 343,243 |
| December 29, 2024
| Weighted Average Amortization Period |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | 19 |  | $ | 389,918 |  |  | $ | (105,218) |  |  | $ | 284,700 |
Trade names and trademarks | 15 |  | 78,955 |  |  | (22,754) |  |  | 56,201 |
Total intangible assets | 18 |  | $ | 468,873 |  |  | $ | (127,972) |  |  | $ | 340,901 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense | The estimated future aggregate amortization expense of definite-lived intangible assets as of December 28, 2025 is as follows (in thousands):
Fiscal years ended: |
2026 | $ | 29,942
2027 | 27,510 |
2028 | 27,193 |
2029 | 27,193 |
2030 | 26,834 |
Thereafter | 204,571 |
Total | $ | 343,243

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