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Basis Of Presentation (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Apr. 12, 2020 USD ($) restaurant | Apr. 14, 2019 USD ($) restaurant | Feb. 29, 2020 | Apr. 12, 2020 USD ($) restaurant segment | Apr. 14, 2019 USD ($) restaurant | Sep. 29, 2019 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  |  | 2,246 | 2,240 |  | 2,246 | 2,240 |
Number of operating segments | segment |  |  |  |  |  |  |  | 1 |  |
Contractual obligation (percent) |  |  | 4.00% |  |  |  | 5.00% |  |  |
Collection period for marketing fees |  |  | 24 months |  |  |  |  |  |  |
Incremental Corporate Advertising Contributions |  |  |  |  |  |  |  | $ 0 | $ 2,000 |
Marketing and advertising expense |  |  |  |  | $ 3,500 | $ 3,900 |  | 8,900 | 11,100 |
Restricted cash |  |  |  |  | 37,000 |  |  | 37,000 |  | $ 26,000
Straight-line rent accrual | $ 29,000 |  |  |  |  |  |  |  |  |
Unfavorable lease liabilities | 2,100 |  |  |  |  |  |  |  |  |
Exit-related lease liabilities | 19,400 |  |  |  |  |  |  |  |  |
Favorable lease assets | 400 |  |  |  |  |  |  |  |  |
Cumulative-effect from a change in accounting principle | $ (2,900) |  |  |  | $ 0 | $ 0 |  | $ (2,870) | $ (37,330) |
Forecast |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Collection period for marketing fees |  |  |  | 3 months |  |  |  |  |  |
Minimum | Subsequent Event |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual obligation (percent) |  | 2.00% |  |  |  |  |  |  |  |
Maximum | Subsequent Event |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Contractual obligation (percent) |  | 4.00% |  |  |  |  |  |  |  |
Entity Operated Units |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  |  | 144 | 137 |  | 144 | 137 |
Franchised Units |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
Number of restaurants | restaurant |  |  |  |  | 2,102 | 2,103 |  | 2,102 | 2,103 |

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