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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 29, 2019 USD ($) restaurant | Sep. 30, 2018 USD ($) restaurant | Oct. 01, 2017 USD ($) restaurant | Oct. 02, 2016 | Oct. 01, 2018 USD ($) | Dec. 19, 2017 restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of restaurants | restaurant | 2,243 | 2,237 | 2,251 |  |  |
Number of weeks per fiscal year | 52 | 52 | 52 | 53 |  |
Depreciation | $ 55,200 | $ 59,400 | $ 67,400 |  |  |
Amounts recognized on unredeemed gift card balances | 500 | 600 | 500 |  |  |
General liability and workers' comp estimated claims to be paid by insurance providers | $ 3,600 | 3,700 |  |  |  |
Contractual contributions | 5.00% |  |  |  |  |
Marketing Expense | $ 2,000 | 6,200 | 500 |  |  |
Marketing and advertising expense | 19,000 | 28,800 | 36,500 |  |  |
Cumulative effect of new accounting principle in period of adoption |  |  |  |  | $ (37,330) |
Deferred tax assets | 85,564 | 62,140 |  |  |  |
Pension cost reclassification | 1,484 | 1,833 | $ 3,360 |  |  |
Other Assets |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash surrender value of life insurance | $ 112,800 | $ 109,900 |  |  |  |
Minimum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment assigned lives | 1 year |  |  |  |  |
Maximum |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Property, plant and equipment assigned lives | 35 years |  |  |  |  |
Qdoba Brand Restaurant Operations |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  |  |  | 700
Franchise Fees | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cumulative effect of new accounting principle in period of adoption | $ 50,300 |  |  |  |  |
Contract liabilities current | 5,000 |  |  |  |  |
Contract liabilities noncurrent | 45,300 |  |  |  |  |
Deferred tax assets | $ 13,000 |  |  |  |  |

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