Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)			3 Months Ended						4 Months Ended		12 Months Ended
	Dec. 31, 2018	Jan. 01, 2018	Sep. 08, 2019	Jun. 16, 2019	Mar. 24, 2019	Sep. 09, 2018	Jun. 17, 2018	Mar. 25, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017	Dec. 31, 2015
Description Of Business And Summary Of Significant Accounting Policies
Revenue			$ 820,812,000	$ 811,647,000	$ 835,963,000	$ 785,965,000	$ 779,396,000	$ 785,371,000	$ 1,150,352,000	$ 1,082,135,000	$ 3,618,774,000	$ 3,432,867,000	$ 2,787,979,000
Advertising fund assets restricted									105,389,000	112,744,000	105,389,000	112,744,000
Restricted cash and cash equivalent									126,963,000	112,272,000	126,963,000	112,272,000
Depreciation and amortization											59,930,000	53,665,000	44,369,000
Capitalized software amortization expense											22,800,000	18,700,000	14,800,000
Amortization Expenses in 2020									19,200,000		19,200,000
Amortization Expenses in 2021									15,100,000		15,100,000
Amortization Expenses in 2022									8,000,000.0		8,000,000.0
Amortization Expenses in 2023									2,100,000		2,100,000
Amortization Expenses in 2024									800,000		800,000
Amortization Expenses, thereafter									700,000		700,000
Amortization of Debt Issuance Costs											4,700,000	8,000,000.0	11,000,000.0
Exposures for workers' compensation and general liability programs									1,000,000.0		1,000,000.0
Insurance Reserves									$ 50,300,000	$ 45,900,000	50,300,000	45,900,000
Revenue reduction due to profit-sharing obligation											143,500,000	132,700,000	119,700,000
Interest paid											142,300,000	132,800,000	107,400,000
Cash paid for income taxes											80,300,000	71,700,000	122,600,000
Capital expenditure accrual											$ 6,900,000	$ 3,800,000	$ 4,000,000.0
Common stock dividend declared, per share			$ 0.65	$ 0.65	$ 0.65	$ 0.55	$ 0.55	$ 0.55	$ 0.65	$ 0.55	$ 2.60	$ 2.20	$ 1.84
Common stock dividend declared, paid											$ 105,715,000	$ 92,166,000	$ 84,298,000
Total insurance limits under the retention programs									$ 110,000,000.0		110,000,000.0
Adjustment to beginning retained deficit		$ 15,000,000.0
Contract liability, Current		2,400,000							4,200,000	$ 4,000,000.0	4,200,000	4,000,000.0
Contract liability, Noncurrent		12,600,000							16,300,000	15,900,000	16,300,000	15,900,000
Deferred tax asset									$ 10,073,000	5,526,000	$ 10,073,000	5,526,000
Percentage of royalty fee									5.50%		5.50%
Percentage of profit-sharing arrangements with participating stores											50.00%
Operating Lease, Right-of-Use Asset	$ 226,800,000								$ 228,785,000		$ 228,785,000
Operating Lease, Liability	226,800,000								236,049,000		236,049,000
Derecognition of Liabilities	1,900,000
Deferred tax liability									35,447,000	35,697,000	35,447,000	35,697,000
Advertising expense											390,799,000	358,526,000
Accounting Standards Update 2014-09 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Deferred tax asset		$ 3,500,000
Term of franchise store agreement		10 years
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 6,400,000
Deferred tax liability		1,600,000
Accounting Standards Update 2018-02 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Adjustment to beginning retained deficit		$ 400,000
2017 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs													16,800,000
Debt issuance costs written off													5,500,000
2018 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs										8,200,000		8,200,000
Debt issuance costs written off												3,200,000
Class A-2 Notes [Member] | 2015 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs														$ 17,400,000
Class A-2 Notes [Member] | 2017 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs													$ 16,800,000
Class A-2 Notes [Member] | 2018 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs										8,200,000		8,200,000
Class A-2 Notes [Member] | 2019 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs									8,100,000		8,100,000
2015 Fixed Rate Notes [Member] | Class A-2 Notes [Member] | 2018 Recapitalization [Member]
Description Of Business And Summary Of Significant Accounting Policies
Debt issuance costs written off												$ 3,200,000
Minimum [Member]
Description Of Business And Summary Of Significant Accounting Policies
Owned and non-owned automobile liabilities									500,000		500,000
Maximum [Member]
Description Of Business And Summary Of Significant Accounting Policies
Owned and non-owned automobile liabilities									3,000,000.0		$ 3,000,000.0
2019 Dividend [Member]
Description Of Business And Summary Of Significant Accounting Policies
Common stock dividend declared, per share											$ 2.60
Common stock dividend declared, paid											$ 105,600,000
2018 Dividend [Member]
Description Of Business And Summary Of Significant Accounting Policies
Common stock dividend declared, per share												$ 2.20
Common stock dividend declared, paid												$ 92,200,000
2017 Dividend [Member]
Description Of Business And Summary Of Significant Accounting Policies
Common stock dividend declared, per share													$ 1.84
Common stock dividend declared, paid													$ 84,200,000
January One 2020 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue, Remaining Performance Obligation, Amount									4,200,000		4,200,000
January One 2021 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue, Remaining Performance Obligation, Amount									3,100,000		3,100,000
January One 2022 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue, Remaining Performance Obligation, Amount									2,800,000		2,800,000
January One 2023 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue, Remaining Performance Obligation, Amount									2,600,000		2,600,000
January One 2024 [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue, Remaining Performance Obligation, Amount									2,300,000		2,300,000
January One Thereafter [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue, Remaining Performance Obligation, Amount									5,500,000		5,500,000
Property Plant and Equipment [Member]
Description Of Business And Summary Of Significant Accounting Policies
Depreciation and amortization											37,100,000	35,000,000.0	29,600,000
Cash Equivalents Held in Interest Reserve [Member]
Description Of Business And Summary Of Significant Accounting Policies
Restricted cash and cash equivalent									48,700,000	36,500,000	48,700,000	36,500,000
Cash and Cash Equivalents Held for Future Interest Payment [Member]
Description Of Business And Summary Of Significant Accounting Policies
Restricted cash and cash equivalent									157,400,000	130,300,000	157,400,000	130,300,000
Other Restricted Cash [Member]
Description Of Business And Summary Of Significant Accounting Policies
Restricted cash and cash equivalent									3,200,000	200,000	3,200,000	200,000
Advertising Fund Restricted Cash and Cash Equivalents [Member]
Description Of Business And Summary Of Significant Accounting Policies
Restricted cash and cash equivalent									84,000,000.0	45,000,000.0	84,000,000.0	45,000,000.0
Other Assets [Member] | U.S. Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Inatangible assets Acquired									1,300,000		1,300,000
Other Accrued Liabilities And Prepaid Expenses [Member]
Description Of Business And Summary Of Significant Accounting Policies
Reclassification of Accrued Liabilities to the Right of Use Asset	$ 7,900,000
U.S. franchise stores [Member] | Cash and cash equivalents [Member] | U.S. Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Advertising fund assets restricted									84,000,000.0		84,000,000.0
U.S. franchise stores [Member] | Cash, cash equivalents and investments [Member] | U.S. Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Advertising fund assets restricted										95,100,000		95,100,000
U.S. franchise stores [Member] | Accounts receivable [Member] | U.S. Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Advertising fund assets restricted									15,300,000	15,300,000	15,300,000	15,300,000
U.S. franchise stores [Member] | Prepaid expenses [Member] | U.S. Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Advertising fund assets restricted									6,100,000	2,300,000	6,100,000	2,300,000
U.S. Company-owned stores [Member] | U.S. Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Advertising fund assets restricted									$ 3,500,000	$ 5,500,000	$ 3,500,000	5,500,000
International Franchise [Member] | Alaska and Hawaii [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue													2,600,000
Domestic Stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Percentage of sales contribution									6.00%		6.00%
U.S. franchise [Member] | Domestic Franchise Advertising [Member]
Description Of Business And Summary Of Significant Accounting Policies
Advertising expense											$ 390,800,000	358,500,000
U.S. Stores [Member] | U.S. franchise stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue											428,504,000	391,493,000	351,387,000
U.S. Stores [Member] | U.S. Company-owned stores [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue											453,560,000	514,804,000	490,846,000
Advertising expense											37,600,000	43,400,000	$ 39,800,000
U.S. Stores [Member] | Domestic Franchise Advertising [Member]
Description Of Business And Summary Of Significant Accounting Policies
Revenue											$ 390,799,000	$ 358,526,000