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Revenues Financial Statement Impact of Adoption (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 26, 2018 | Sep. 27, 2017 | Sep. 26, 2018 | Sep. 27, 2017 | Dec. 28, 2017 | Dec. 27, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Prepaid and other current assets | $ 10,495 |  |  | $ 10,495 |  |  |  | $ 11,788
Deferred income taxes | 15,595 |  |  | 15,595 |  |  |  | 16,945
Other current liabilities | 53,911 |  |  | 53,911 |  |  |  | 59,246
Other noncurrent liabilities | 43,888 |  |  | 43,888 |  |  |  | 27,951
Deficit | (317,917) |  |  | (317,917) |  |  |  | (334,661)
Revenue from contract with customers, excluding assessed tax | 158,023 | $ 132,384 | [1] | 470,630 | $ 393,670 | [1] |  |
Costs of franchise and license revenue | 28,174 | 9,493 |  | 85,779 | 29,483 |  |  |
Provision for income taxes | 2,810 | 5,429 |  | 7,217 | 15,103 |  |  |
Net income | $ 10,805 | $ 9,325 |  | $ 32,190 | $ 26,447 |  |  |
Basic net income per share | $ 0.17 | $ 0.14 |  | $ 0.50 | $ 0.38 |  |  |
Diluted net income per share | $ 0.16 | $ 0.13 |  | $ 0.49 | $ 0.37 |  |  |
Total comprehensive income | $ 15,363 | $ 9,548 |  | $ 37,047 | $ 24,531 |  |  |
Deferred income tax expense |  |  |  | 5,044 | 9,936 |  |  |
Other current assets |  |  |  | 1,292 | 834 |  |  |
Other accrued liabilities |  |  |  | (7,733) | (4,834) |  |  |
Other noncurrent liabilities |  |  |  | (2,339) | (2,285) |  |  |
Net cash flows provided by operating activities |  |  |  | 46,259 | 43,525 |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | $ 20,976 | $ (15,446)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Prepaid and other current assets | 509 |  |  | 509 |  |  |  |
Deferred income taxes | (5,040) |  |  | (5,040) |  |  |  |
Other current liabilities | (360) |  |  | (360) |  |  |  |
Other noncurrent liabilities | (18,618) |  |  | (18,618) |  |  |  |
Deficit | 14,447 |  |  | 14,447 |  |  |  |
Costs of franchise and license revenue | (20,007) |  |  | (60,306) |  |  |  |
Provision for income taxes | (101) |  |  | (348) |  |  |  |
Net income | $ (289) |  |  | $ (999) |  |  |  |
Basic net income per share | $ 0.00 |  |  | $ (0.01) |  |  |  |
Diluted net income per share | $ 0.00 |  |  | $ (0.02) |  |  |  |
Total comprehensive income | $ (289) |  |  | $ (999) |  |  |  |
Deferred income tax expense |  |  |  | (348) |  |  |  |
Other current assets |  |  |  | (509) |  |  |  |
Other accrued liabilities |  |  |  | 621 |  |  |  |
Other noncurrent liabilities |  |  |  | 1,235 |  |  |  |
Net cash flows provided by operating activities |  |  |  | 0 |  |  |  |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Prepaid and other current assets | 11,004 |  |  | 11,004 |  |  |  |
Deferred income taxes | 10,555 |  |  | 10,555 |  |  |  |
Other current liabilities | 53,551 |  |  | 53,551 |  |  |  |
Other noncurrent liabilities | 25,270 |  |  | 25,270 |  |  |  |
Deficit | (303,470) |  |  | (303,470) |  |  |  |
Costs of franchise and license revenue | 8,167 |  |  | 25,473 |  |  |  |
Provision for income taxes | 2,709 |  |  | 6,869 |  |  |  |
Net income | $ 10,516 |  |  | $ 31,191 |  |  |  |
Basic net income per share | $ 0.17 |  |  | $ 0.49 |  |  |  |
Diluted net income per share | $ 0.16 |  |  | $ 0.47 |  |  |  |
Total comprehensive income | $ 15,074 |  |  | $ 36,048 |  |  |  |
Deferred income tax expense |  |  |  | 4,696 |  |  |  |
Other current assets |  |  |  | 783 |  |  |  |
Other accrued liabilities |  |  |  | (7,112) |  |  |  |
Other noncurrent liabilities |  |  |  | (1,104) |  |  |  |
Net cash flows provided by operating activities |  |  |  | 46,259 |  |  |  |
Deferred franchise revenue [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | 21,000 |
(Deficit) [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | 100 |
Deferred Tax Asset [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | (5,400) |
Other Liabilities [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | (600) |
Other Current Liabilities [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | 500 |
Adjustments for New Accounting Pronouncement [Member] | (Deficit) [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cumulative effect adjustment recognized upon adoption of Topic 606 |  |  |  |  |  |  | $ (15,600) |
Franchise [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customers, excluding assessed tax | 54,414 | $ 34,469 |  | 163,087 | $ 103,621 |  |  |
Franchise [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customers, excluding assessed tax | (20,397) |  |  | (61,653) |  |  |  |
Franchise [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customers, excluding assessed tax | 34,017 |  |  | 101,434 |  |  |  |
Advertising [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customers, excluding assessed tax | 19,500 |  |  | 58,400 |  |  |  |
Costs of franchise and license revenue | 19,500 |  |  | 58,400 |  |  |  |
Deferred franchise revenue [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customers, excluding assessed tax | 400 |  |  | 1,400 |  |  |  |
Other Franchise Services [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customers, excluding assessed tax | 500 |  |  | 1,900 |  |  |  |
Costs of franchise and license revenue | $ 500 |  |  | $ 1,900 |  |  |  |
[1] | As disclosed in Note 2, prior period amounts have not been adjusted under the modified retrospective method of adoption of Topic 606.

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