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Significant Accounting Policies - Stock-Based Compensation, PP&E, and Deferred Costs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Stock-Based Compensation |  |  |
Vesting period | 3 years |  |
Property and Equipment |  |  |
Depreciation expense | $ 42.6 | $ 39.7 | $ 39.7
Deferred Costs |  |  |
Deferred costs, maximum amortization period | 5 years |  |
Deferred costs | $ 4.1 | 2.9 | $ 2.6
Unamortized systems development costs | $ 11.1 | $ 9.8 |
Restaurant, commissary and other equipment | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 5 years |  |
Restaurant, commissary and other equipment | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 10 years |  |
Buildings and improvements | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 20 years |  |
Buildings and improvements | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 40 years |  |
Technology and communication assets |  |  |
Property and Equipment |  |  |
Estimated useful lives | 5 years |  |
Leasehold improvements | Minimum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 5 years |  |
Leasehold improvements | Maximum |  |  |
Property and Equipment |  |  |
Estimated useful lives | 10 years |  |

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