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Revenues Financial Statement Impact of Adoption (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 27, 2018 | Jun. 28, 2017 | Jun. 27, 2018 | Jun. 28, 2017 | Dec. 28, 2017 | Dec. 27, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Prepaid and other current assets | $ 12,040 |  | $ 12,040 |  |  | $ 11,788
Deferred income taxes | 19,333 |  | 19,333 |  |  | 16,945
Other current liabilities | 53,218 |  | 53,218 |  |  | 59,246
Other noncurrent liabilities | 47,831 |  | 47,831 |  |  | 27,951
Deficit | (328,722) |  | (328,722) |  |  | (334,661)
Franchise and license revenue | 54,593 | $ 35,021 | 108,673 | $ 69,152 |  |
Costs of franchise and license revenue | 29,049 | 10,244 | 57,605 | 19,990 |  |
Provision for income taxes | 2,578 | 4,930 | 4,407 | 9,674 |  |
Net income | $ 11,626 | $ 8,749 | $ 21,385 | $ 17,122 |  |
Basic net income per share | $ 0.18 | $ 0.13 | $ 0.33 | $ 0.24 |  |
Diluted net income per share | $ 0.18 | $ 0.12 | $ 0.32 | $ 0.24 |  |
Total comprehensive income | $ 15,016 | $ 7,219 | $ 21,684 | $ 14,983 |  |
Deferred income tax expense |  |  | 2,896 | 6,291 |  |
Other current assets |  |  | (253) | 3,587 |  |
Other accrued liabilities |  |  | (6,352) | (365) |  |
Other noncurrent liabilities |  |  | (1,345) | (1,068) |  |
Net cash flows provided by operating activities |  |  | 26,096 | $ 32,818 |  |
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 | (5,141) |  | (5,141) |  |  |
Other current liabilities | (1,230) |  | (1,230) |  |  |
Other noncurrent liabilities | (18,138) |  | (18,138) |  |  |
Deficit | 14,736 |  | 14,736 |  |  |
Franchise and license revenue | (20,949) |  | (41,256) |  |  |
Costs of franchise and license revenue | (20,535) |  | (40,299) |  |  |
Provision for income taxes | (107) |  | (247) |  |  |
Net income | $ (307) |  | $ (710) |  |  |
Basic net income per share | $ 0.00 |  | $ (0.01) |  |  |
Diluted net income per share | $ (0.01) |  | $ (0.01) |  |  |
Total comprehensive income | $ (307) |  | $ (710) |  |  |
Deferred income tax expense |  |  | (247) |  |  |
Other current assets |  |  | (509) |  |  |
Other accrued liabilities |  |  | 851 |  |  |
Other noncurrent liabilities |  |  | 615 |  |  |
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 | 12,549 |  | 12,549 |  |  |
Deferred income taxes | 14,192 |  | 14,192 |  |  |
Other current liabilities | 51,988 |  | 51,988 |  |  |
Other noncurrent liabilities | 29,693 |  | 29,693 |  |  |
Deficit | (313,986) |  | (313,986) |  |  |
Franchise and license revenue | 33,644 |  | 67,417 |  |  |
Costs of franchise and license revenue | 8,514 |  | 17,306 |  |  |
Provision for income taxes | 2,471 |  | 4,160 |  |  |
Net income | $ 11,319 |  | $ 20,675 |  |  |
Basic net income per share | $ 0.18 |  | $ 0.32 |  |  |
Diluted net income per share | $ 0.17 |  | $ 0.31 |  |  |
Total comprehensive income | $ 14,709 |  | $ 20,974 |  |  |
Deferred income tax expense |  |  | 2,649 |  |  |
Other current assets |  |  | (762) |  |  |
Other accrued liabilities |  |  | (5,501) |  |  |
Other noncurrent liabilities |  |  | (730) |  |  |
Net cash flows provided by operating activities |  |  | 26,096 |  |  |
Initial and other fees [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) |
Initial and other fees [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Franchise and license revenue | 400 |  | 1,000 |  |  |
Advertising [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Franchise and license revenue | 19,500 |  | 38,800 |  |  |
Costs of franchise and license revenue | 19,500 |  | 38,800 |  |  |
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] |  |  |  |  |  |
Franchise and license revenue | 1,000 |  | 1,500 |  |  |
Costs of franchise and license revenue | $ 1,000 |  | $ 1,500 |  |  |

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