| 
           Subsequent Events (Details) 
         | 
        4 Months Ended | 
|---|---|
| 
           Apr. 21, 2013
 
          item 
         | 
      |
| Subsequent Events | |
| Number of events requiring recognition | 0 | 
| X | ||||||||||
| 
             
- Definition 
          Represents the number of events requiring recognition or disclosure through the date of issuance of the report. No definition available. 
  | 
        
| X | ||||||||||
| 
             
- Details 
          
  |