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Revenue (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 27, 2020 | Jul. 05, 2020 | Apr. 12, 2020 | Sep. 29, 2019 | Jul. 07, 2019 | Apr. 14, 2019 | Jan. 19, 2020 | Jan. 20, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 255,401 | $ 242,275 | $ 216,157 | $ 221,235 | $ 222,359 | $ 215,727 | $ 307,673 | $ 290,786 | $ 1,021,506 | $ 950,107 | $ 869,690
Company restaurant sales |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 348,987 | 336,807 | 448,058
Franchise rental revenues |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 320,647 | 272,815 | $ 259,047
Franchise royalties |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 171,407 | 163,047 |
Marketing fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 158,258 | 157,969 |
Technology and sourcing fees |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 15,295 | 12,705 |
Franchise fees and other services |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 6,912 | $ 6,764 |

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