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FAIR VALUE - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended | 49 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 07, 2021 | Dec. 28, 2025 | Dec. 28, 2025 | Dec. 29, 2024 | Dec. 31, 2023 | Sep. 28, 2025 | Nov. 22, 2021
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Contingent consideration liability |  |  | $ (2,291) | $ 0 | $ 0 |  |
Fair Value, Liability, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  | Impairment and closure costs, Restructuring charges |  |  |  |
Impairment and closure costs |  |  | $ 12,065 | 2,218 | $ 624 |  |
Impairment of property and equipment and operating lease assets |  |  | $ 11,300 |  |  |  |
Minimum |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Discount rate |  |  | 7.50% |  |  |  |
Maximum |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Discount rate |  |  | 9.50% |  |  |  |
IPO |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Shares issued (in dollars per share) |  |  |  |  |  |  | $ 28.00
Spyce |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Contingent consideration liability | $ 16,400 | $ 7,000 | $ 7,000 | 15,000 |  |  |
Additional shares issued (in shares) | 714,285 |  |  |  |  |  |
Covenant, acquisition company share holders (in shares) | 1,316,763 |  |  |  |  |  |
Spyce | Other Current Liabilities |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | 9,700 |  |  |
Spyce | Contingent Consideration Liability |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Contingent consideration liability |  |  |  | $ 5,300 |  |  |
Spyce | Maximum |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Contingent consideration liability | $ 20,000 |  |  |  |  |  |
Spyce | Former Equity Holders, Additional Equity |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Upfront portion (in dollars per share) |  | $ 13.62 | $ 13.62 |  |  |  |
Contingent consideration liability |  |  | $ 10,400 |  |  |  |
Acquisition company share holders, not continuously held (in shares) |  | 570,249 | 570,249 |  |  |  |
Business combination, contingent consideration, liability, earnout |  | $ 6,000 |  |  |  |  |
Business combination, contingent consideration, liability, equity interests issued and issuable, earnout |  | 2,100 |  |  |  |  |
Business combination, contingent consideration, liability, cash, earnout |  | $ 3,900 |  |  |  |  |
Business acquisition, share price |  | $ 10.20 | $ 10.20 |  |  |  |
Spyce | Former Equity Holders, Additional Equity | Milestone Two |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Business combination, contingent consideration, liability, earnout |  | $ 7,000 |  |  |  | $ 23,400 |
Business combination, contingent consideration, liability, equity interests issued and issuable, earnout |  | 4,700 |  |  |  |  |
Business combination, contingent consideration, liability, cash, earnout |  | $ 2,300 |  |  |  |  |
Business acquisition, share price |  | $ 19.40 | $ 19.40 |  |  |  |
Spyce | Former Equity Holders, Additional Equity | Milestone One |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |
Business combination, contingent consideration, liability, equity interests issued and issuable, earnout |  |  |  |  |  | 6,800 |
Business combination, contingent consideration, liability, cash, earnout |  |  |  |  |  | $ 16,600 |

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