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Common Stock Dividends (Tables)
9 Months Ended
Oct. 31, 2012
Dividends, Common Stock [Abstract]  
Common Stock Dividends, Record Date And Payable Date
Record Date
  
Payable Date
March 12, 2012
  
April 4, 2012
May 11, 2012
  
June 4, 2012
August 10, 2012
  
September 4, 2012
December 7, 2012
  
December 27, 2012