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Commitments and contingencies - Narrative (Details) $ in Thousands |  | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Aug. 03, 2007 period | Dec. 31, 2024 | Dec. 31, 2023 USD ($) restaurant | Dec. 31, 2022 USD ($) | Dec. 31, 2021 | Dec. 31, 2024 USD ($)
Line of Credit Facility [Line Items] |  |  |  |  |  |
Reinvestment plan term |  |  | 3 years |  |  |
Percentage of gross sales of restaurants | 5.00% |  |  |  |  |
Initial royalty period | 10 years |  |  |  |  |
Royalty fee (as a percent) |  |  | 6.00% | 5.60% | 5.20% |
Number of subsequent payment periods | period | 2 |  |  |  |  |
Percentage of gross sales on advertising and promotion activities |  |  | 5.00% |  |  |
Required minimum fixed charge coverage ratio |  |  | 1.50 |  |  |
Maximum leverage ratio |  |  | 4.25 |  |  |
Number of new restaurants | restaurant |  |  | 200 |  |  |
Number of modernize restaurants | restaurant |  |  | 400 |  |  |
Provision for contingencies |  |  | $ 50,619 | $ 44,839 |  |
Provision for contingencies, current |  |  | 1,447 | 2,272 |  |
Provision for contingencies, noncurrent |  |  | 49,172 | 42,567 |  |
Provision related to claims covered by indemnification agreement |  |  | 1,458 | $ 1,297 |  |
Minimum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Tax law, estimate of possible loss |  |  | 511,000 |  |  |
Maximum |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Tax law, estimate of possible loss |  |  | 576,000 |  |  |
Standby letters of credit |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Standby letters of credit with an aggregate drawing amount |  |  | $ 80,000 |  |  |
Scenario, forecast |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Royalty fee (as a percent) |  | 6.00% |  |  |  |
Capital expenditures |  |  |  |  |  | $ 650,000
Next five years |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Royalty fee (as a percent) | 6.00% |  |  |  |  |
Last five years |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Initial royalty period | 5 years |  |  |  |  |
Royalty fee (as a percent) | 7.00% |  |  |  |  |

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