Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Details Textual)

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Commitments and Contingencies (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 28, 2012
Apr. 30, 2011
Commitments and Contingencies (Textual) [Abstract]    
Non-cancelable operating lease terms, minimum 3 years  
Non-cancelable operating lease terms, maximum 10 years  
Total rent expense under operating leases $ 26,067 $ 21,857