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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 27, 2017 | Dec. 28, 2016 | Dec. 30, 2015 | Dec. 28, 2017
Accounting Policies [Abstract] |  |  |  |
Short-term investments | $ 1,900 | $ 500 |  |
Net gain on investments | 1,600 | 900 | $ 100 |
Deferred compensation plan investments | 12,700 | 11,200 |  |
Cash overdrafts | 2,200 | 4,100 |  |
Discounted insurance liabilities | $ 16,900 | $ 19,200 |  |
Self insurance liabilities, discount rate | 2.00% | 1.50% |  |
Undiscounted insurance liabilities | $ 18,100 | $ 20,000 |  |
Revenue recognized in breakage on gift cards | 300 | 300 | 300 |
Deferred fees | 1,600 | 2,100 |  |
Advertising expense | 14,300 | 13,100 | 12,500 |
Advertising contributions from franchisees | 79,700 | 76,500 | 72,500 |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment |  | 9,139 |  | $ (21,000)
Initial and other franchise fees | 2,500 | 2,700 | 2,500 |
Other franchise fees | $ 2,900 | 3,600 | $ 2,900 |
Other Noncurrent Assets [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment |  | (200) |  |
Excess Tax Benefits [Member] | Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment |  | 9,000 |  |
Estimated Forfeitures [Member] | Retained Earnings [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment |  | (400) |  |
Paid-in Capital [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative effect adjustment |  | $ 551 |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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