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Basis Of Presentation (Details) $ in Thousands | 4 Months Ended
--- | ---
Jan. 20, 2019 USD ($) restaurant | Jan. 21, 2018 USD ($) restaurant
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |
Pension Cost Reclassification | $ 456 | $ 564
Document Fiscal Year Focus | 2019 |
Number of restaurants | restaurant | 2,241 | 2,250
Contractual obligation | 5.00% |
Incremental Corporate Advertising Contributions | $ 2,000 |
Marketing and advertising expense | $ 7,200 | $ 8,900
Entity Operated Units |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |
Number of restaurants | restaurant | 137 | 255
Franchised Units |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |
Number of restaurants | restaurant | 2,104 | 1,995
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Accounting Standards Update 2014-09 [Member] | Franchise Fees [Member] |  |
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items] |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | $ 50,300 |
Contract with Customer, Liability, Current | (4,963) |
Contract liabilities noncurrent | $ 45,300 |

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