| Dec 29, 2013 | Dec 28, 2014 | Dec 27, 2015 | Dec 25, 2016 | Dec 31, 2017 | Dec 30, 2018 | Dec 29, 2019 | Dec 27, 2020 | Dec 26, 2021 | Dec 25, 2022 | Dec 31, 2023 | Dec 29, 2024 |
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| Net income | 1 | 4 | 6 | 8 | -7 | -9 | -24 | -66 | -24 | 5 | 6 | 41 |
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| Depreciation | 18 | 20 | 21 | 23 | 26 | 23 | 22 | 20 | 16 | 12 | 12 | 13 |
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| Noncash lease expense | - | - | - | - | - | - | 28 | 27 | 26 | 26 | 26 | 24 |
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| Deferred income tax | -2 | -0 | -0 | -2 | 6 | -3 | 14 | 0 | 0 | 0 | - | -34 |
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| Stock-based compensation expense | 12 | 3 | 2 | 3 | 5 | 3 | 2 | 3 | 2 | 3 | 5 | 6 |
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| Asset Impairment Shop Closure And Disposal Of Property And Equipment | - | - | - | - | - | - | - | - | - | - | - | -0 |
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| Gain on Franchise Growth Acceleration Initiative activities | - | - | - | - | - | - | - | - | - | - | 2 | - |
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| Loss on Franchise Growth Acceleration Initiative activities | - | - | - | - | - | - | - | - | - | - | - | 0 |
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| Loss (gain) on extinguishment of debt | - | - | - | - | - | - | - | - | - | - | -0 | -2 |
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| Amortization of debt issuance costs | - | - | - | - | - | - | - | - | - | - | 0 | - |
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| Accounts receivable, net | -0 | 1 | 0 | -1 | 1 | -0 | -0 | 0 | 2 | 0 | 2 | 2 |
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| Inventories | 0 | 1 | 0 | 0 | 0 | -0 | -0 | -0 | 1 | 0 | -0 | 0 |
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| Prepaid expenses and other assets | 2 | 4 | 1 | -3 | 3 | 1 | -6 | -1 | -1 | 1 | 4 | 2 |
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| Accounts payable | -0 | 1 | 2 | -2 | 0 | 0 | -0 | 2 | 0 | 2 | -1 | -1 |
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| Operating lease liabilities | - | - | - | - | - | - | -30 | -16 | -33 | -28 | -31 | -28 |
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| Accrued expenses and other liabilities | 2 | 1 | 4 | 4 | 1 | 2 | -4 | 7 | 4 | 0 | 8 | -1 |
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| Net cash provided by operating activities | 30 | - | - | - | - | 31 | 18 | -12 | -5 | 12 | 19 | 20 |
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| Purchases of property and equipment | 28 | 29 | 36 | 37 | 35 | 21 | 14 | 11 | 9 | 8 | 17 | 19 |
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| Proceeds from sales of refranchised shops | - | - | - | - | - | - | - | - | - | - | 6 | 0 |
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| Other investing activities | - | - | - | - | - | - | - | - | - | - | - | 0 |
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| Net cash used in investing activities | -28 | - | - | - | - | -21 | -14 | -11 | -9 | -8 | -11 | -19 |
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| Term Loan | - | - | - | - | - | - | - | - | - | - | 25 | - |
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| Proceeds from Long-Term Lines of Credit | - | - | - | - | - | - | - | 61 | 38 | 39 | - | - |
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| Term Loan | - | - | - | - | - | - | - | - | - | - | 3 | - |
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| Repayments of lines of credit | - | - | - | - | - | - | - | 55 | 34 | 40 | - | - |
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| Payment of debt issuance costs | - | - | - | - | - | - | 0 | 1 | 0 | 0 | 2 | 1 |
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| Proceeds from exercise of warrants | - | - | - | - | - | - | - | - | 15 | - | 1 | 1 |
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| Employee taxes on certain stock-based payment arrangements | - | 1 | 1 | 0 | - | 0 | 0 | 1 | 1 | 1 | 1 | 2 |
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| Proceeds from Noncontrolling Interests | - | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | - | - | 0 |
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| Distributions to non-controlling interest | - | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 0 | 1 | 1 |
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| Treasury Stock repurchase | - | 10 | 40 | 22 | 13 | 23 | 4 | - | - | - | - | 1 |
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| Net cash (used in) provided by financing activities | 45 | - | - | - | - | -15 | -5 | 15 | 17 | -3 | 10 | -23 |
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| Net change in cash and cash equivalents | - | - | - | - | - | - | -1 | -8 | 3 | 1 | 19 | -22 |
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| Income taxes paid | 2 | 3 | 2 | 4 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 1 |
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| Interest paid | - | - | - | - | - | 0 | 0 | 1 | 1 | 1 | 3 | 1 |
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| Capital Expenditures Incurred but Not yet Paid | 3 | 3 | 3 | 3 | 2 | 1 | 1 | 1 | 0 | 1 | 1 | 1 |
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| Unpaid Liability For Employee Taxes On Certain Stock-Based Arrangements | - | - | - | - | - | - | - | - | 0 | 0 | 0 | 0 |
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