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6. Earnings Per Share (Detail)
3 Months Ended
Apr. 29, 2012
Jan. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (in years) 3 years  
Restricted Stock Units, Vested, Stock Award 1  
Share-based Compensation by Share-based Payments, Unvested Restricted Stock Outstanding, Net 46,176 32,005