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Share Repurchase - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended 1 Months Ended
Feb. 02, 2013
Jan. 28, 2012
Oct. 31, 2012
Maximum
Jun. 05, 2012
Maximum
Aug. 17, 2011
Maximum
Stockholders Equity Note [Line Items]          
Stock repurchase authorized amount     $ 25 $ 15 $ 25
Stock repurchased during period, shares 2,535,370 3,212,628      
Stock repurchased during period, value $ 25 $ 25      
Stock Repurchased During Period, Average Price $ 9.86 $ 7.78