| Oct 3, 2010 | Oct 2, 2011 | Sep 30, 2012 | Sep 29, 2013 | Sep 28, 2014 | Sep 27, 2015 | Oct 2, 2016 | Oct 1, 2017 | Sep 30, 2018 | Sep 29, 2019 | Sep 27, 2020 | Oct 3, 2021 | Oct 2, 2022 | Oct 1, 2023 | Sep 29, 2024 |
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| Net (loss) earnings | 70 | 81 | 58 | 51 | 89 | 109 | 124 | 135 | 121 | 94 | 90 | 166 | 116 | 131 | -37 |
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| Depreciation and amortization | 102 | 96 | 98 | 96 | 91 | 89 | 93 | 89 | 59 | 55 | 53 | 47 | 56 | 62 | 60 |
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| Amortization Of Lease Improvement Allowances And Incentives | - | - | - | - | - | - | - | - | - | - | - | - | 4 | 5 | 5 |
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| Deferred finance cost amortization | 2 | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 6 | 6 | 5 | 5 | 5 |
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| Loss on extinguishment of debt | -1 | - | - | -1 | -1 | - | - | - | - | -3 | - | - | -8 | - | - |
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| Excess tax deficiency from share-based compensation arrangements | - | - | - | - | - | - | - | - | - | - | - | - | -0 | -0 | -0 |
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| Deferred income taxes | -28 | -13 | -7 | -19 | 4 | -3 | 35 | -12 | 25 | 4 | 5 | 8 | 8 | -12 | -11 |
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| Share-based compensation expense | 11 | 8 | 7 | 11 | 10 | 12 | 11 | 11 | 9 | 8 | 4 | 4 | 7 | 11 | 13 |
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| Pension and postretirement expense | 29 | 24 | 34 | 31 | 14 | 19 | 13 | 4 | 2 | 1 | 42 | 1 | 0 | 7 | 7 |
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| (Gains) losses on cash surrender value of company-owned life insurance | -6 | 1 | -12 | -9 | -6 | 1 | -5 | -2 | -2 | -4 | 4 | 13 | -13 | 7 | 16 |
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| Gains on the sale of company-operated restaurants | 55 | 61 | 29 | 5 | -4 | -3 | 1 | 38 | 46 | 1 | 3 | 4 | 4 | 18 | 3 |
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| Gains on acquisition of restaurants | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 3 |
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| Losses (gains) on the disposition of property and equipment, net | -11 | -8 | -6 | -3 | -3 | -2 | -3 | -4 | -2 | 6 | 10 | 7 | 31 | 8 | -0 |
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| Impairment charges and other | - | - | - | - | - | - | 5 | 8 | 3 | 5 | 0 | 3 | 8 | 6 | 171 |
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| Accounts and other receivables | 8 | 26 | -3 | -34 | -20 | 0 | 28 | 6 | -24 | -4 | 29 | -5 | 18 | 4 | -20 |
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| Inventories | -0 | 2 | -4 | -27 | 0 | -0 | 1 | -2 | -2 | -0 | -0 | 0 | -0 | -1 | 0 |
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| Prepaid expenses and other current assets | 23 | -19 | 13 | -13 | 17 | -35 | 15 | -15 | 9 | -9 | 3 | 3 | 3 | 1 | 0 |
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| Operating lease right-of-use assets and lease liabilities | - | - | - | - | - | - | - | - | - | - | - | 25 | -3 | -2 | -23 |
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| Accounts payable | -2 | 1 | -3 | -27 | -1 | 2 | 2 | 0 | 5 | 5 | 0 | -3 | 16 | -2 | -15 |
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| Accrued liabilities | - | - | 0 | -11 | 20 | 1 | 9 | -21 | -38 | -8 | 4 | 29 | -9 | 47 | -135 |
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| Pension and postretirement contributions | 24 | 5 | 20 | 24 | 25 | 25 | 101 | 5 | 5 | 6 | 6 | 6 | 7 | 6 | 6 |
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| Franchise tenant improvement allowance and incentive disbursements | - | - | - | - | - | - | - | - | 15 | 11 | 8 | 9 | 3 | 3 | 2 |
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| Other | - | - | - | - | - | - | 4 | -11 | -16 | -9 | -1 | 1 | -7 | -1 | -6 |
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| Cash flows provided by operating activities | 62 | 124 | 137 | 199 | 201 | 227 | 134 | 172 | 104 | 168 | 144 | 201 | 163 | 215 | 69 |
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| Purchases of property and equipment | 96 | 129 | 80 | 85 | 61 | 86 | 97 | 67 | 32 | 48 | 20 | 41 | 46 | 75 | 115 |
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| Proceeds from the sale and leaseback of assets | - | - | - | 47 | 6 | - | 17 | 6 | 9 | 4 | 20 | 4 | 11 | 4 | 2 |
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| Acquisition of Del Taco, net of cash acquired | 8 | 31 | 49 | 12 | 2 | - | 20 | 2 | - | - | - | - | 581 | - | - |
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| Proceeds from the sale of company-operated restaurants | - | - | - | - | - | - | - | - | - | - | - | - | 6 | 85 | 19 |
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| Proceeds from the sale of property and equipment | - | - | - | - | - | - | - | - | 10 | 10 | 23 | 12 | 31 | 25 | 25 |
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| Other | -3 | -2 | -0 | -4 | -3 | -2 | 0 | -1 | -3 | -2 | -3 | -3 | -0 | -3 | - |
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| Cash flows (used in) provided by investing activities | 19 | -36 | -82 | -34 | -43 | -84 | -104 | 33 | 66 | -14 | 29 | -21 | -579 | 42 | -69 |
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| Proceeds from Long-Term Lines of Credit | 881 | 721 | 576 | 646 | 652 | 857 | 705 | 748 | 757 | 230 | 114 | - | 68 | - | 6 |
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| Repayments of borrowings on revolving credit facilities | 721 | 605 | 603 | 721 | 521 | 768 | 818 | 533 | 524 | 960 | 7 | 108 | 18 | 50 | - |
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| Proceeds from issuance of debt | - | - | - | - | - | - | - | - | - | - | - | - | 1,100 | - | - |
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| Principal repayments on debt | - | - | - | - | - | - | - | - | - | - | 11 | 1 | 588 | 30 | 30 |
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| Debt issuance costs | 10 | 1 | 1 | 4 | 4 | 2 | 2 | - | 1 | 34 | 0 | - | 21 | - | - |
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| Dividends paid on common stock | - | - | - | - | 16 | 37 | 40 | 49 | 45 | 41 | 28 | 37 | 37 | 36 | 34 |
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| Proceeds from issuance of common stock | 5 | 6 | 10 | 62 | 32 | 15 | 11 | 5 | 8 | 1 | 5 | 7 | 0 | 0 | 0 |
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| Repurchases of common stock | 97 | 193 | 30 | 133 | 324 | 320 | 285 | 334 | 326 | 138 | 156 | 200 | 25 | 90 | 70 |
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| Payroll tax payments for equity award issuances | - | - | - | - | - | - | - | - | 8 | 3 | 6 | 4 | 1 | 2 | 3 |
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| Cash flows (used in) provided by financing activities | -123 | -88 | -58 | -164 | -157 | -135 | -30 | -215 | -446 | -6 | -87 | -344 | 478 | -207 | -131 |
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| Net (decrease) increase in cash and restricted cash | - | - | - | - | - | - | - | - | - | - | - | -163 | 62 | 50 | -132 |
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