| 
           CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) 
        In Thousands, unless otherwise specified  | 
        4 Months Ended | |
|---|---|---|
| 
           Apr. 21, 2013 
         | 
        
           Apr. 15, 2012 
         | 
      |
| CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS | ||
| Labor, stock-based compensation | $ 69 | $ 143 | 
| Selling, general and administrative, stock-based compensation | $ 1,123 | $ 1,059 | 
| 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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- Details 
          
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