| 
           Commitments and Contingencies (Details) (USD $) 
        In Thousands, unless otherwise specified  | 
        3 Months Ended | |
|---|---|---|
| 
           Apr. 30, 2011 
         | 
        
           May 01, 2010 
         | 
      |
| Commitments and contingencies (Textuals) [Abstract] | ||
| Non-cancelable operating lease terms, minimum | 3 | |
| Non-cancelable operating lease terms, maximum | 10 | |
| Total rent expense under operating leases | $ 21,857 | $ 19,459 | 
| X | ||||||||||
| 
             
- Definition 
          Commitments and contingencies. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Non cancelable operating lease terms maximum. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Non cancelable operating lease terms minimum. 
  | 
        
| X | ||||||||||
| 
             
- Definition 
          Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
  |