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3. Property, Plant and Equipment (Detail) (USD $)
9 Months Ended
Oct. 28, 2012
Jan. 29, 2012
Oct. 28, 2012
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross, Period Increase (Decrease)     $ 1,900,000
Leasehold Improvements, Gross 2,700,000    
Construction in Progress, Gross $ 1,279,000 $ 3,680,000