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Common Stock Dividends
3 Months Ended
Apr. 30, 2016
Dividends, Common Stock [Abstract]  
Dividends payable
Common Stock Dividends
Dividends Declared
On February 18, 2016, the Board of Directors approved the fiscal 2017 annual dividend of $2.00 per share, an increase over the fiscal 2016 annual dividend of $1.96 per share. For fiscal 2017, the annual dividend will be paid in four quarterly installments of $0.50 per share, according to the following record and payable dates:
Record Date
  
Payable Date
March 11, 2016
  
April 4, 2016
May 13, 2016
  
June 6, 2016
August 12, 2016
  
September 6, 2016
December 9, 2016
  
January 3, 2017

The dividend installment payable on April 4, 2016 was paid as scheduled.