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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 29, 2019 | Jul. 07, 2019 | Apr. 14, 2019 | Sep. 30, 2018 | Jul. 08, 2018 | Apr. 15, 2018 | Jan. 20, 2019 | Jan. 21, 2018 | Sep. 29, 2019 | Sep. 30, 2018 | Oct. 01, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 221,235 | $ 222,359 | $ 215,727 | $ 177,472 | $ 187,983 | $ 209,772 | $ 290,786 | $ 294,463 | $ 950,107 | $ 869,690 | $ 1,097,291
Company restaurant sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 336,807 | 448,058 | 715,921
Franchise rental revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 272,815 | $ 259,047 | $ 231,578
Franchise royalties |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 163,047 |  |
Marketing fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 157,969 |  |
Technology and sourcing fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 12,705 |  |
Franchise fees and other services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 6,764 |  |

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