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Fair Value Measurements Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 30, 2018
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents $ 205,393 $ 222,228
Other investments in equity securities 639 639
Guarantees of franchisee loan obligations 12 17
Reported Value Measurement | Series 2018-1 Class A-2-I Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 444,375 445,500
Reported Value Measurement | Series 2018-1 Class A-2-II Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 469,063 470,250
Reported Value Measurement | Series 2015-1 Class A-2-II Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 868,500 870,750
Reported Value Measurement | Series 2015-1 Class A-2-III Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 482,500 483,750
Reported Value Measurement | 7% Debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 91,086 90,769
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents 205,393 222,228
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Other investments in equity securities 2,179 2,181
Guarantees of franchisee loan obligations 12 17
Estimate of Fair Value Measurement | Series 2018-1 Class A-2-I Notes | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 439,656 424,026
Estimate of Fair Value Measurement | Series 2018-1 Class A-2-II Notes | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 461,952 439,353
Estimate of Fair Value Measurement | Series 2015-1 Class A-2-II Notes | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 876,065 865,342
Estimate of Fair Value Measurement | Series 2015-1 Class A-2-III Notes | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 495,711 482,522
Estimate of Fair Value Measurement | 7% Debentures | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument $ 99,000 $ 102,750