| 
           Commitments and Contingencies (Details) (USD $) 
        In Thousands  | 
        3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
| 
           Jul. 30, 2011 
         | 
        
           Jul. 31, 2010 
         | 
        
           Jul. 30, 2011 
         | 
        
           Jul. 31, 2010 
         | 
      |
| Commitments and contingencies (Textuals) [Abstract] | ||||
| Non-cancelable operating lease terms, minimum | 3 years | |||
| Non-cancelable operating lease terms, maximum | 10 years | |||
| Total rent expense under operating leases | $ 23,127 | $ 20,135 | $ 44,984 | $ 39,594 | 
| X | ||||||||||
| 
             
- Definition 
          Commitments and contingencies. 
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| X | ||||||||||
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- Definition 
          Non cancelable operating lease terms maximum. 
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| X | ||||||||||
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- Definition 
          Non cancelable operating lease terms minimum. 
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| X | ||||||||||
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- 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. 
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