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11. Subsequent Events (Detail) (USD $)
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 05, 2012
Jul. 29, 2012
Jul. 31, 2011
Jul. 29, 2012
Jul. 31, 2011
Dividends Payable, Date Declared Sep. 05, 2012        
Common Stock, Dividends, Per Share, Declared (in Dollars per share) $ 0.10 $ 0.10 $ 0.10 $ 0.10 $ 0.10
Dividends Payable, Date to be Paid Nov. 30, 2012        
Dividends Payable, Date of Record Nov. 16, 2012