| 
           Advertising Costs (Details) (USD $) 
        In Millions, unless otherwise specified  | 
        4 Months Ended | |
|---|---|---|
| 
           Apr. 21, 2013
 
          item 
         | 
        
           Apr. 15, 2012 
         | 
      |
| Advertising Costs | ||
| Advertising and marketing costs | $ 11.1 | $ 9.9 | 
| Number of marketing and national media advertising funds to which the entity and franchisees must contribute a minimum percentage of revenue | 2 | |
| X | ||||||||||
| 
             
- Definition 
          The number of marketing and advertising funds the entity and franchisees are required to contribute a certain percentage of revenue under the franchise agreements. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          The total expense recognized in the period for promotion, public relations, and brand or product advertising. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  |