| CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended | ||
|---|---|---|---|
| Dec. 25, 2016 | Dec. 27, 2015 | Dec. 28, 2014 | |
| Income Statement [Abstract] | |||
| Labor, stock-based compensation | $ 181 | $ 115 | $ 81 | 
| Selling, general, and administrative expenses, stock-based compensation | $ 4,364 | $ 4,609 | $ 4,089 | 
| X | ||||||||||
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- Definition This element represents the expense recognized in direct labor expense during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees. No definition available. 
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| X | ||||||||||
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- Definition This element represents the expense recognized in selling, general and administrative expense during the period arising from share-based compensation arrangements (for example, shares of stock, stock options or other equity instruments) with employees. No definition available. 
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| X | ||||||||||
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- References No definition available. 
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