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6. Earnings Per Share (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2012
Jul. 29, 2012
Jul. 29, 2012
Jan. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Restricted Stock Units, Vested, Stock Award     1  
Share-based Compensation by Share-based Payments, Unvested Restricted Stock Outstanding, Net   56,749 56,749 32,005
Stock Repurchased and Retired During Period, Shares 35,300 22,400    
Share Repurchase Authorization Plan (in Dollars)     $ 12.5