Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Details Textual)

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Summary of Significant Accounting Policies (Details Textual) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 28, 2012
Jul. 30, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]        
Number of shares granted in stock option     183 124
Weighted average fair value of stock option     $ 45.00 $ 28.62
Stock compensation expenses $ 3,454 $ 2,388 $ 6,346 $ 5,196
Unrecognized compensation expense related to unvested stock awards $ 36,616   $ 36,616