Description of Business	12 Months Ended
Description of Business	Dec. 28, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Organization Structure Centuri Holdings, Inc. (“Holdings” and, collectively with the Operating Company (as defined below) and its consolidated subsidiaries, the “Company” or “Centuri”) was formed as a Delaware corporation in June 2023. Holdings was formed for the purpose of completing an initial public offering and facilitating the separation of Centuri Group, Inc. (the “Operating Company”) from Southwest Gas Holdings, Inc. (“Southwest Gas Holdings”) in order to carry on the business of the Operating Company. On April 13, 2024, Holdings issued 71,664,592 shares of common stock to Southwest Gas Holdings as consideration for the transfer of assets and assumption of liabilities of the Operating Company (“the Separation”). Following the completion of the Separation, the Operating Company became a wholly owned subsidiary of Holdings, and all of Holdings’ operations are conducted through the Operating Company. The Operating Company is considered to be Holdings’ predecessor for accounting purposes. Description of Operations The Company is a North American utility and energy infrastructure services company, and it partners with regulated utilities to maintain, upgrade, and expand the energy network that powers millions of homes and businesses. The Company’s service offerings primarily consist of the modernization of utility infrastructure through the replacement, maintenance, retrofitting and installation of electric and natural gas distribution and utility-scale transmission networks and building capacity to meet current and future demands. The Company operates through a family of complementary companies working together across different geographies to establish solid customer relationships and a strong reputation for a wide range of capabilities. Separation from Southwest Gas Holdings On April 17, 2024, the registration statement related to the initial public offering of Holdings’ common stock was declared effective, and Holdings’ common stock began trading on the New York Stock Exchange (“NYSE”) under the ticker “CTRI” (the “Centuri IPO”) on April 18, 2024. On April 22, 2024, the Centuri IPO and a concurrent private placement were completed with total final net proceeds to the Company of $327.7 million. As of the closing of the Centuri IPO, Southwest Gas Holdings owned 71,665,592 shares of Holdings’ common stock (“CTRI shares”), or approximately 81% of the total outstanding CTRI shares. Subsequent to the Centuri IPO, Southwest Gas Holdings divested all of its remaining ownership interest in the Company through the course of several transactions described in more detail below. The Company did not receive any proceeds from any of these transactions. •On May 22, 2025 and June 18, 2025, Southwest Gas Holdings completed secondary public offerings, selling a total of 21,562,500 CTRI shares, with additional private placements closing on May 22, 2025 and July 8, 2025, in which Southwest Gas Holdings sold a total of 3,917,382 CTRI shares to Icahn Partners LP and Icahn Partners Master Fund LP, investment entities associated with Carl C. Icahn (“Icahn Partners”). After these transactions, Southwest Gas Holdings owned 46,185,710 CTRI shares, or approximately 52% of total outstanding CTRI shares. •On August 11, 2025, Southwest Gas Holdings completed another secondary public offering of 17,250,000 CTRI shares and concurrent private placement to Icahn Partners of 1,573,500 CTRI shares (together, the “August sell-down”). After completion of the August sell-down, Southwest Gas Holdings owned 27,362,210 CTRI shares, or approximately 31% of total outstanding CTRI shares, resulting in (i) the loss of its controlling interest in the Company and (ii) the Company ceasing to be a “controlled company” under the NYSE rules. •On September 5, 2025, Southwest Gas Holdings completed a final secondary public offering (the “Final Disposition”) of its remaining 27,362,210 CTRI shares. As a result, Southwest Gas Holdings no longer holds any ownership interest in the Company and relinquished governance rights originally afforded to it under the Separation Agreement, including the right to nominate any members of the Company’s Board of Directors (the “Board”) and to approve certain of the Company’s corporate actions. For additional information about the Separation Agreement and other agreements signed as part of the Separation and Centuri IPO, refer to “Note 17 — Related Parties.” Sale of Common Stock On November 14, 2025, the Company completed an underwritten public offering of 7,441,860 CTRI shares and concurrent private placement to Icahn Partners of 3,488,372 CTRI shares. The underwriters in the public offering subsequently exercised their option to purchase an additional 1,116,279 CTRI shares in December 2025 (the public offering, including the exercise of the underwriters’ option to purchase additional shares, and private placement are hereafter referred to together as the “November Offering”). The Company received total net proceeds of $250.9 million from the November Offering. As a result of the November Offering, Icahn Partners’ ownership increased to approximately 14.2% of total outstanding CTRI shares. The Company primarily used the net proceeds from the November Offering to repay borrowings outstanding under its credit agreement and to fund the acquisition of Connect, which closed on November 18, 2025. Refer to “Note 8 — Acquisitions” for additional details about the Connect acquisition, and “Note 12 — Long-Term Debt” for additional details about the Company’s remaining debt obligations under its credit agreement.