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Common Stock Dividends
3 Months Ended
Apr. 30, 2018
Dividends, Common Stock [Abstract]  
Dividends payable
Common Stock Dividends
Dividends Declared
On February 20, 2018, the Board of Directors approved the fiscal year ending January 31, 2019 ("fiscal 2019") annual dividend of $2.08 per share, an increase over the fiscal 2018 annual dividend of $2.04 per share. For fiscal 2019, the annual dividend will be paid in four quarterly installments of $0.52 per share, according to the following record and payable dates:
Record Date
  
Payable Date
March 9, 2018
  
April 2, 2018
May 11, 2018
  
June 4, 2018
August 10, 2018
  
September 4, 2018
December 7, 2018
  
January 2, 2019

The dividend installments payable on April 2, 2018 and June 4, 2018 were paid as scheduled.