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
Apr. 28, 2012
Apr. 30, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]    
Number of shares granted in stock option 35 45
Weighted average fair value of stock option $ 46.78 $ 26.11
Stock compensation expenses $ 2,893 $ 2,808
Unrecognized compensation expense related to unvested stock awards $ 30,532