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Fair Value Measurements Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 30, 2018
Reported Value Measurement    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents $ 221,818 $ 222,228
Other investments in equity securities 639 639
Guarantees of franchisee loan obligations 9 17
Reported Value Measurement | Series 2019-1 Class A-2-I Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 400,000 0
Reported Value Measurement | Series 2019-1 Class A-2-II Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 450,000 0
Reported Value Measurement | Series 2018-1 Class A-2-I Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 443,250 445,500
Reported Value Measurement | Series 2018-1 Class A-2-II Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 467,875 470,250
Reported Value Measurement | Series 2015-1 Class A-2-II Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 0 870,750
Reported Value Measurement | Series 2015-1 Class A-2-III Notes    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 481,250 483,750
Reported Value Measurement | 7% Debentures    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 91,403 90,769
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Cash equivalents 221,818 222,228
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Other investments in equity securities 1,945 2,181
Guarantees of franchisee loan obligations 9 17
Estimate of Fair Value Measurement | Series 2019-1 Class A-2-I Notes | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 402,704 0
Estimate of Fair Value Measurement | Series 2019-1 Class A-2-II Notes | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument 453,146 0
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 446,747 424,026
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 469,756 439,353
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 0 865,342
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 500,519 482,522
Estimate of Fair Value Measurement | 7% Debentures | Fair Value, Inputs, Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions    
Debt instrument $ 105,750 $ 102,750